Health ConditionsThe American Optometric Association (AOA) defines computer vision syndrome (CVS) or digital eye strain as a group of eye and vision-related problems that results from prolonged usage of computers, tablets, e-readers, and cell phones, which causes increased stress to near vision in particular. Digital eye strain (DES) is an entity encompassing visual and ocular symptoms arising due to the prolonged use of digital electronic devices. It is characterized by dry eyes, itching, foreign body sensation, watering, blurring of vision, and headache. Non-ocular symptoms associated with eye strain include stiff neck, general fatigue, headache, and backache.
Digital eye strain has been used synonymously with ocular asthenopia secondary to digital devices, computer vision syndrome, eye strain post computer or mobile usage, or visual fatigue. Computer Vision Syndrome is a growing health concern in the digital age, with a reported prevalence of 69.0%. It is caused by screen-related, environmental, ergonomic, and physiological factors, affecting diverse demographics.
In the United States, the self-reported prevalence of digital eye strain ranges from 60–69% and is more frequently reported in genetic females. The COVID-19 pandemic significantly amplified CVS due to increased screen time for remote work, online learning, and social media use, with studies reporting symptoms in up to 74% of individuals. University students report the highest prevalence rates due to increased screen time and inadequate ergonomic practices.
Symptoms reported by computer users are classified into internal ocular symptoms (strain and ache), external ocular symptoms (dryness, irritation, burning), visual symptoms (blur, double vision), and musculoskeletal symptoms (neck and shoulder pain).
A frequent complaint is blurry vision. The patient typically complains of blur and clear vision episodes, and eye strain. This usually reduces their concentration but improves after rest. Another set of symptoms is that the patient complains of glare, excessive sensitivity to light, and inability to keep the eyes open.
Digital eye strain results in a range of symptoms such as eye discomfort, headaches, and neck and shoulder pain. CVS has an effect on reduced productivity and visual and musculoskeletal impairment and a negative impact on cardiac rhythms and sleep patterns.
While not one of the most common symptoms, digital eye strain can cause dizziness or vertigo. This is because there is a strong connection between the eyes and the vestibular system—a sensory system responsible for providing the brain with information about motion, head position, and spatial orientation. The eyes give the vestibular system vital information to maintain a clear and steady perception of the world, so if and when the eyes are strained due to prolonged digital screen use, the vestibular system can become affected, resulting in dizziness.
Computer vision syndrome affects multiple parts of the visual system, from tear film disruption to ciliary muscle fatigue and associated headache patterns. The ocular surface system, accommodative apparatus, extraocular muscles, lacrimal system, musculoskeletal system (particularly the cervical spine), and the vestibular system are all implicated in the full presentation of DES.
Extended use of computers or digital screens poses unique challenges that increase the risk of CVS, as the visual demands differ from traditional tasks, with distinct viewing distances and angles stressing eye focusing and movement, while screen resolution, contrast, refresh rates, and glare further contribute to eye symptoms.
Environmental and computer factors such as improper workstations, poor lighting, contrast, and resolution, slow refresh rate, glare of the display, excessive screen brightness, and imbalance of light between the computer screen and surrounding working room all contribute to CVS. Viewing a computer or digital screen is different than reading a printed page. Often the letters on the computer or handheld device are not as precise or sharply defined, the level of contrast of the letters to the background is reduced, and the presence of glare and reflections on the screen may make viewing difficult.
Among the potential factors, blue light emitted from digital screens has drawn considerable attention. Proponents argue that blue light may increase visual fatigue and discomfort, with some researchers linking it to symptoms of CVS. Studies indicate that prolonged exposure to blue LEDs in mice is linked to apoptosis and oxidative damage to the cornea, with similar effects like reduced cell viability and increased reactive oxygen species observed in human corneal and conjunctival cells, potentially leading to ocular surface inflammation, worsening dry eye disease, and exacerbating CVS symptoms. However, there is a growing body of literature that suggests that blue light-filtering eyeglasses may not help reduce digital eye strain.
The major factors associated with CVS are either environmental (improper lighting, display position and viewing distance) and/or dependent on the user's visual abilities (uncorrected refractive error, oculomotor disorders, and tear film abnormalities). People with prior eye conditions, like uncorrected vision or eye muscle imbalance, are at greater risk of eye strain.
Computer Vision Syndrome represents a growing concern in modern ophthalmic practice due to prolonged screen exposure and reduced blink rate, and is characterized by eye strain, blurred vision, and ocular surface instability. Current evidence suggests that suboptimal micronutrient intake and obesity may exacerbate its symptoms, but direct nutritional causality remains limited.
Screen time disrupts sleep hygiene through both blue light exposure and cognitive stimulation, while significantly increasing the incidence and progression of ophthalmological issues such as digital eye strain and myopia. Given the implications of blue light exposure on circadian rhythm disturbances, the potential for carotenoid vitamin therapy to elicit meaningful improvements on sleep outcomes likely represents clinically relevant findings that warrant further investigation.
Lutein and zeaxanthin are not associated with a distinct traditional herbal or folk medicine use in the manner of botanical herbs. They are naturally occurring yellow-orange pigments concentrated in leafy green vegetables and egg yolks. Their use as targeted supplements is a modern nutritional development, driven by their known concentration in the macula of the human retina.
Lutein and zeaxanthin are fat-soluble antioxidant nutrients that have evidence of beneficial effects on vision and eye health. Lutein and zeaxanthin are carotenoid pigments that accumulate in the macula — the central part of the retina responsible for sharp, detailed vision. They function as a natural blue light filter (absorbing 40 to 90% of incoming blue light) and as antioxidants that neutralize reactive oxygen species generated by light exposure.
A pivotal clinical trial was published in Frontiers in Nutrition (2025): a two-arm, 6-month, parallel-group, randomized, double-blind, placebo-controlled trial enrolled seventy volunteers aged 18 to 65 who used electronic screens for more than 6 hours daily and supplemented them with 10 mg of lutein and 2 mg of zeaxanthin-isomers or a placebo. Outcome measures included several ophthalmic examinations comprising the Schirmer tear test, photo-stress recovery time, contrast sensitivity, tear film break-up time, and self-report measures of visual fatigue, computer vision, sleep quality and attention. Compared to the placebo, lutein and zeaxanthin supplementation was associated with greater improvements in the Schirmer tear test, photo-stress recovery time, and tear film break-up time. However, there were no between-group differences in the change in self-report measures or contrast sensitivity. The study was funded by an industry partner (Bio-gen Extracts), a relevant limitation.
A further 24-week multicenter, randomized, double-blind, placebo-controlled trial of 600 participants (the LZO clinical trial) was registered, recruiting individuals aged over 18 who use digital devices for over 8 hours daily, with primary outcomes including change in macular pigment optical density (MPOD). This trial was ongoing at time of publication.
Nutraceutical strategies involving xanthophyll macular carotenoids demonstrate enhanced cognitive functioning and overall visual performance that aids digital eye strain. Early reports involving university students with excessive screen time exposure (≥6 h/day) reported significant improvements in overall sleep quality scores (Pittsburgh Sleep Quality Index) following six months of nutraceutical intervention with macular carotenoids.
Evidence strength: Moderate and growing. Multiple RCTs specifically targeting screen users show objective improvements in tear film parameters and photo-stress recovery. Self-reported symptom outcomes are less consistent. Most trials are small, short-duration, and industry-funded, warranting cautious interpretation.
An anthocyanin (AC) complex from bilberry (Vaccinium myrtillus L.) fruit is widely used in Europe for medicinal purposes and as a dietary supplement in countries in East Asia, especially Japan. European folk medicine historically used bilberry preparations for a wide range of visual complaints, and during World War II, bilberry jam was allegedly consumed by Royal Air Force pilots to improve night vision—a claim that has since received mixed scientific scrutiny. Bilberry anthocyanins have been reported to enhance night visual acuity and are used as a supplement in traditional contexts.
A key RCT examined bilberry specifically in VDT workers: a prospective, randomized, double-blind, placebo-controlled study enrolled 281 office workers aged 20–40 years who used VDTs, screened by critical flicker fusion (CFF) and near point accommodation (NPA). Participants were randomized to either a bilberry extract (480 mg/day) or placebo group and took allocated capsules daily for 8 weeks. Measurements included CFF, NPA, contrast visual acuity, functional visual acuity, keratoconjunctival epithelial damage, fluorescein tear film break-up time, and 18 subjective symptoms of eye fatigue evaluated by questionnaire.
A further 6-week study of bilberry-derived anthocyanins in VDT users was conducted: consumption of the supplement containing anthocyanins extracted from bilberry for 6 weeks inhibited the decrease in the accommodative function caused by oxidative stress due to VDT use. This was a randomized, placebo-controlled, double-blind, parallel-group comparison study involving 32 healthy Japanese adults with eye fatigue after using visual display terminals. Subjects were randomly allocated into either the active group (bilberry-derived anthocyanin 43.2 mg per capsule) or placebo group. Subjects consumed either one active or placebo capsule once a day for 6 weeks. The primary outcome measured was the change in percentage of pupillary response pre- and post-VDT use, whereas the secondary outcomes were tear film break-up time, Schirmer's value, muscle hardness, and subjective symptoms.
The anti-oxidative and immunosuppressive properties of anthocyanin phytochemicals may also confer protective effects against visually induced cognitive stress and digital asthenopia.
In a systematic review of 30 clinical studies to examine the bilberry effect on vision in reduced light conditions, Canter and Ernst found that testing of psychophysical outcome parameters was weak evidence due to a lack of strict study designs (e.g., non-randomized or non-placebo controlled).
Evidence strength: Preliminary to moderate. The highest-quality studies are small (n = 32 to 281) and largely conducted in Japanese populations, limiting generalizability. Combined ingredient studies make it difficult to isolate the effect of bilberry anthocyanins alone. The evidence for accommodative function protection during VDT use is more consistent than for subjective symptom relief.
Astaxanthin has no established traditional botanical or herbal medicine history; it is a ketocarotenoid derived primarily from the microalga Haematococcus pluvialis. Its use as a targeted supplement for visual fatigue is entirely a contemporary nutritional development, originating largely in Japanese clinical research from the early 2000s onward.
A human clinical trial in Japan showed that consuming 9 mg of astaxanthin daily over four weeks significantly improved the eyes' ability to accommodate different focuses and reduce eye strain, hazy vision, flickering images, shoulder or back stiffness compared to the control group. Astaxanthin has been reported to have an ocular accommodation improvement effect, and acts as a substance to help with asthenopia recovery and could contribute to the improvement of blood circulation in peripheral systems.
A double-blind crossover study examined accommodative function directly: healthy subjects received 6 mg/day of astaxanthin or placebo for 14 days, and were then assigned a near visual task for 20 minutes. Accommodative function and subjective symptoms relating to eye strain were measured before and after the task, and after a 10-minute rest. After the task, accommodation contraction and relaxation times were extended in both groups. Comparison between the two groups showed that accommodation relaxation time was significantly extended in the placebo group, in contrast to the astaxanthin group. Accommodative contraction and relaxation times were significantly prolonged after the 10-minute rest in the placebo group compared to astaxanthin.
A combination RCT examined the synergistic potential of multiple carotenoids: effects of a test food containing anthocyanin, astaxanthin, and lutein on eye function in healthy Japanese adults with eye fatigue after operating visual display terminals were examined. Forty-four subjects were randomly but equally assigned to the active or placebo group. Two active or placebo capsules were taken once daily for 6 weeks. Accommodative function, tear film break-up time, visual acuity, Schirmer's test, macular pigment optical density level, muscle hardness, and a questionnaire were evaluated. The active group showed a significant improvement in the percentage of pupillary response of an average of both eyes and dominant eye pre- and post-visual display terminal operation at 6 weeks compared with the placebo group.
A further multi-ingredient study in older adults found: near-point accommodation (NPA) and subjective symptoms were evaluated both before and after four weeks' intake. The variation in NPA of both eyes from baseline to 4 weeks in the test supplement group was significantly higher than in the placebo group. Forty-eight subjects aged 45 to 64 years who felt eye strain on a daily basis took a multiple dietary supplement containing astaxanthin, lutein, bilberry extract, black soybean hull extract (as cyanidin-3-glucoside), and DHA for four consecutive weeks, which suggested that the multiple dietary supplement should improve not only accommodative ability but also subjective symptoms related to asthenopia.
Evidence strength: Moderate, particularly for accommodative function in VDT workers. The majority of published trials are Japanese, small in scale (n = 25–100), and several are industry-funded. Combination ingredient studies are more common than single-ingredient astaxanthin trials in digital eye strain specifically, making it difficult to attribute effects solely to astaxanthin.
Consumption of oily fish as a traditional dietary staple — particularly in coastal and Nordic populations — represents an indirect traditional context for omega-3 fatty acid intake in general health, though no specific traditional medicine system applied fish oil specifically to eye fatigue or VDT-related complaints.
For the management of ocular surface symptoms in digital eye strain, the capacity for omega-3 fatty acids to offer clinical benefits against the underlying mechanisms of dry eye disease is supported by robust scientific evidence. In randomized clinical trials, short-term dietary supplementation with omega-3 PUFAs demonstrated enhanced therapeutic benefits in patients with mild-to-moderate dry eye disease.
A systematic review and meta-analysis of RCTs found: compared with placebo, omega-3 FA supplementation decreased dry eye symptoms (SDM = 0.968; P < 0.001) and corneal fluorescein staining, whereas it increased the break-up time (BUT) and Schirmer test values. This meta-analysis provides evidence that omega-3 FA supplementation significantly improves dry eye symptoms and signs in patients with dry eye disease, indicating that omega-3 FA supplementation may be an effective treatment for dry eye disease.
A large RCT specifically in VDT users was conducted: a randomized controlled study enrolled eyes of 470 VDT users randomized to receive four capsules twice daily for 6 months, each containing 180 mg of eicosapentaenoic acid (EPA) and 120 mg docosahexaenoic acid (DHA). The omega-3 group was compared with another group who received four capsules of a placebo (olive oil) twice daily. Patients were evaluated at baseline, 1, 3, and 6 months. There was a significant change in omega-3 index, dry eye symptoms, and tear film tests in patients who received the active omega supplement; the change was not significant in patients who received olive oil.
A 2023 systematic review and meta-regression found: in meta-regression analysis of dry eye symptoms, the daily dose of omega-3, duration of omega-3 intake, and percentage of EPA exhibited a significant positive correlation with a reduction in dry eye symptom scores. Similar trends were noted in TBUT, Schirmer tests, and osmolarity scores. Based on the evidence, omega-3 FAs effectively reduce DED symptoms, especially in high doses, for a long duration, and with increased EPA levels. However, given the heterogeneity in study results and diverse patient characteristics, caution is needed in generalizing these findings.
Among studied micronutrients, the efficacy of omega-3 fatty acid supplementation in ameliorating dry eye disease signs and symptoms is supported by robust scientific evidence.
Evidence strength: Strong for dry eye disease, which is a major component of DES. Evidence is more robust for clinical dry eye populations than for unselected screen users. Heterogeneity across trials (differing doses, formulations, populations) limits precise dosing conclusions.
The consumption of liver, eggs, and orange/yellow plant foods for the maintenance of vision has roots in numerous traditional food cultures. Ancient Egyptians reportedly consumed roasted ox liver for night blindness — a condition now understood to reflect vitamin A deficiency. Traditional Chinese medicine has long emphasized foods rich in provitamin A carotenoids (carrots, pumpkin) for eye health.
Vitamin A deficiency leads to non-wettability of the ocular surface, in turn leading to severe desiccation (xerophthalmia), corneal scarring, and a high risk of ocular morbidity. Vitamin A is vital for the number, and hence secretory activity, of the conjunctival goblet cells. Restoration of systemic vitamin A results in a rapid resolution of the dry eye state in the presence of sufficient protein.
Vitamin A supports ocular surface repair and maintenance. A strong link exists between vitamin A deficiency and dry eye. Vitamin A is necessary for normal differentiation of non-squamous epithelium, as keratinization is a direct consequence of its deficiency.
The nutritional status can affect the ocular surface. This is particularly the case for vitamin A, because of its role in ocular surface epithelium trophism. While vitamin A deficiency-induced dry eye is a well-established clinical finding, the direct evidence for vitamin A supplementation specifically improving DES-related dry eye in otherwise replete populations is limited and has not been established through large RCTs.
Evidence strength: Strong for deficiency states; limited evidence for supplementation in nutritionally replete individuals with DES specifically.
Citrus fruits, berries, and rose hips have been used in traditional European, Asian, and Indigenous health practices to support general wellness. No tradition specifically directed vitamin C-rich preparations at eye fatigue or screen-related complaints.
Vitamin C deficiency can contribute to the development of dry eyes. Tears are essential for maintaining ocular comfort, clarity, and health. When there is an inadequate supply of tears, the eyes may become dry and irritated, causing discomfort, redness, and a gritty feeling. Vitamin C's role in maintaining eye health includes supporting the mucous membranes that produce tears. A deficiency in this essential nutrient can disrupt the normal tear film composition, leading to dry eyes and associated discomfort.
The lens and retina suffer oxidative damage and the anti-oxidant vitamins A, C, and E are implicated as protective. Vitamins C and E, both potent antioxidants, help alleviate symptoms of dry eye disease by reducing oxidative stress.
A study using a multivitamin complex containing ascorbic acid alongside other antioxidants in dry eye patients found: the vitamin complex produced a 38.2% increase in tear break-up time and improved Schirmer's test scores after 3 months of twice-daily supplementation. Treatment also reduced symptoms as measured by the OSDI by 30.5% and decreased visual analog pain scores by 20.1%. Researchers concluded that oral multivitamin supplementation may be an effective treatment option for patients with intractable dry eye, likely due to the antioxidant properties of the vitamins helping to reduce oxidative stress and inflammation of the ocular surface.
Evidence strength: Moderate for dry eye-related ocular surface protection; vitamin C is studied primarily as part of multi-ingredient formulations. Isolated vitamin C supplementation specifically for DES has not been definitively established.
No established traditional medicine use specifically for visual fatigue. Wheat germ oil, nuts, and seeds have been dietary sources across many cultures, but their application for eye conditions is not documented in classical herbal traditions.
Vitamin E, a fat-soluble antioxidant, plays a crucial role in protecting the ocular surface from oxidative damage. Similar to vitamin C, it helps neutralize free radicals that can disrupt tear film stability and contribute to dry eye. By reducing oxidative damage to corneal epithelial cells, vitamin E helps maintain the integrity of the tear film and promote a healthier ocular surface.
Deficiencies in vitamins A, D, E, C, and B-complex were consistently linked to ocular surface inflammation, retinal oxidative stress, cataracts, AMD, and nutritional optic neuropathies in a 2024 narrative review. Oxidation and inflammation are implicated in the etiology of these diseases. There is evidence that dietary antioxidants and anti-inflammatories may provide benefit in decreasing the risk of age-related eye disease.
Evidence strength: Limited for DES specifically; evidence is stronger in the context of age-related eye disease and dry eye. Vitamin E is typically studied within multi-nutrient AREDS-type formulations rather than in isolation for digital eye fatigue.
Zinc-rich foods such as oysters, meats, and legumes have historically been part of traditional diets associated with visual maintenance, although no classical herbal system applied isolated zinc specifically to eye fatigue.
Zinc has a role in retinal metabolism and may be beneficial in macular degeneration. Certain systemic conditions with associated dry eye symptoms also allow dietary factors to be identified as important for the health or homeostasis of the tear film, including zinc, manganese, niacin, and vitamins B6 and C. Altered levels of zinc, copper, selenium, and magnesium were associated with impaired photoreceptor function, glaucoma risk, and retinal degeneration.
Micronutrients including vitamins A, C, D, and E, along with zinc and carotenoids (lutein and zeaxanthin), contribute to tear film stability, inflammation reduction, and ocular surface protection through multiple mechanisms. Zinc's role in DES is largely understood through its relationship with vitamin A transport: zinc supports retinal function and tear film stability and aids in the transportation of vitamin A from the liver to the eyes, ensuring optimal mucous membrane health.
Evidence strength: Indirect. Zinc's role in ocular health is well-supported for age-related disease (AREDS formulation), but specific evidence in DES is limited.
No specific traditional use for eye strain or visual fatigue. Vitamin D as a nutrient was only identified in the 20th century.
Vitamin D receptors found within the human eye suggest that vitamin D plays a significant role in eye cell functions and may reduce ocular surface inflammation associated with dry eye disease, thereby improving symptoms. Vitamin D supplementation has shown to improve serum vitamin levels, enhancing ocular surface health and tear quality.
A review analyzed in detail the effects on the ocular surface of omega-3 fatty acids, vitamins A, B12, C, D, selenium, curcumin, and flavonoids. Among these, the efficacy of omega-3 fatty acid supplementation in ameliorating dry eye disease signs and symptoms is supported by robust scientific evidence. Further long-term clinical trials are warranted to confirm the safety and efficacy of the supplementation of the other micronutrients and nutraceuticals.
Evidence strength: Preliminary. Mechanistic rationale is plausible, but high-quality RCTs specifically targeting DES with vitamin D supplementation are lacking.
A comprehensive review in the field of nutrition and ocular health focuses on the crucial roles of essential nutrients like Vitamin A, B1, B12, C, D, E, zinc, and folate in maintaining eye well-being. Nutrient deficiencies have significant consequences, leading to various eye-related issues, from night blindness to age-related conditions such as cataracts and macular degeneration.
Compared to most other organs, the eye is particularly susceptible to oxidative damage due to its exposure to light and high metabolism. Recent literature indicates that nutrients important in vision health include vitamins and minerals with antioxidant functions (e.g., vitamins C and E, carotenoids [lutein, zeaxanthin]). A diet rich in leafy greens, oily fish, eggs, nuts, and colourful fruits and vegetables provides the principal dietary sources of these nutrients.
Proper hydration is fundamental for tear production. Ensuring an adequate daily intake of water, based on individual needs and activity levels, is vital for maintaining a healthy tear film. Systemic dehydration can reduce aqueous tear production, compounding the dry-eye component of DES.
Digital eye strain is caused by a variety of factors including duration of screen time, inappropriately adjusted screen settings, poor positioning of screens, and prolonged exposure to blue light. The 20-20-20 rule is widely discussed in the literature: the rule consists of looking at a distant object 20 feet away for at least 20 seconds, every 20 minutes.
Not blinking enough during screen use is a documented contributing factor. During intensive screen work, blink rate can decrease substantially, reducing the spread of the tear film and contributing to evaporative dry eye.
The light from screens, called blue light, makes our bodies produce less of a hormone called melatonin. Melatonin is like our sleep guide. But too much screen time, especially before bedtime, can mess up our sleep routine, making it hard to fall asleep and leaving us feeling tired. Among the most prevalent age groups with heavy screen time behaviors before bed, adolescents and young adults represent growing populations that may be particularly vulnerable to psychosocial implications (sleeping disorders, emotional distress, interpersonal anxiety) associated with digital eye strain.
One of the most significant consequences of excessive screen time is a sedentary lifestyle. Prolonged sitting while engaging with screens leads to a lack of physical activity, adversely impacting cardiovascular health, increasing the risk of obesity, and contributing to the development of chronic conditions. Consistent protective effects of aerobic exercise and high-quality sleep may be associated with favorable metabolic profiles and ocular perfusion, potentially mitigating retinal ganglion cell loss.
Viewing a computer or digital screen is different than reading a printed page. Often the letters on the computer or handheld device are not as precise or sharply defined, the level of contrast of the letters to the background is reduced, and the presence of glare and reflections on the screen may make viewing difficult. Viewing distances and angles used for this type of work are also often different from those commonly used for other reading or writing tasks. Optimisation of workstation ergonomics — including chair height, monitor position, and ambient lighting — is described in clinical guidelines as a primary behavioural intervention.
Modifiable lifestyle factors—including balanced dietary habits, regular physical activity, adequate sleep quality, smoking cessation, and moderation of caffeine and alcohol intake—may beneficially influence pathogenic mechanisms such as oxidative stress, vascular dysregulation, mitochondrial dysfunction, and neuroinflammation. Smoking is established as a risk factor for accelerated oxidative damage to ocular tissues and worsened dry eye, relevant to the DES context.
The potential dietary role for micronutrients with nutraceutical properties to ameliorate various ocular and vision-related symptoms associated with digital eye strain is an active area of investigation. Collectively, preliminary findings seem to offer a strong line of evidence to substantiate the need for additional randomized controlled trials aimed at treating digital eye strain with adjunctive nutraceutical strategies. Further RCT and comparisons on commercially available nutritional supplements are needed to quantify the clinical benefits.
Anthocyanins are the active class of pigment phytochemicals in bilberry and black currant with specific clinical evidence for VDT-induced eye fatigue. A PMC-indexed systematic review (Molecules 2019, PMC6767261) confirms anthocyanins relieve ciliary muscle tension, reduce visual fatigue symptoms, and improve retinal blood flow. Multiple RCTs in VDT workers using anthocyanin extracts show improvements in accommodative function, tear film stability, and subjective eye fatigue.
Anthocyanosides are glycoside forms of anthocyanins found in bilberry and black currant, studied specifically for VDT-related eye fatigue. Nakaishi et al. (Altern Med Rev 2000) demonstrated that black currant anthocyanoside intake reduced VDT work-induced transient refractive alteration in humans. A PMC review (2019) confirms anthocyanosides relieve ciliary muscle tension, a primary driver of digital eye fatigue.
Astaxanthin is a ketocarotenoid derived from Haematococcus pluvialis microalgae with multiple clinical trials demonstrating benefits for digital eye strain and visual fatigue. A 2025 randomized, double-blind, placebo-controlled trial (n=64 children, 4 mg/day, 84 days) in Advances in Therapy found a 20% reduction in computer vision syndrome symptoms and a 27% improvement in visual fatigue versus placebo. Multiple adult trials also show improved accommodative amplitude, retinal blood flow, and ciliary muscle function.
Bilberry (Vaccinium myrtillus) anthocyanins have been studied in multiple RCTs for VDT-induced eye fatigue. A 2015 PubMed-indexed RCT (n=281 office workers, 480 mg/day bilberry extract, 8 weeks) evaluated critical flicker fusion, near point accommodation, and subjective eye fatigue symptoms. A 2020 PMC-published RCT (n=109, 240 mg/day standardized bilberry extract, 12 weeks) demonstrated improvement in ciliary muscle tonic accommodation after VDT tasks. Anthocyanins may penetrate to the ciliary muscle and relieve tension.
Chrysanthemum is a traditional TCM remedy for eye strain from sustained visual effort, and it features in compound preparations clinically used for asthenopia. A randomized placebo-controlled trial of a chrysanthemum-containing botanical formula (n=360) significantly reduced visual fatigue scores over 90 days.
DHA is a structural omega-3 fatty acid found in high concentrations in the retina and is essential for maintaining photoreceptor cell membrane integrity. It has anti-inflammatory properties relevant to the ocular surface dysfunction underlying digital eye strain and dry eye. A 2023 systematic review and meta-analysis (19 RCTs, 4,246 patients) found omega-3 supplementation (EPA+DHA) significantly improved tear film stability and dry eye symptom scores.
Ginkgo biloba extract (GBE) improves ocular microcirculation and has been studied for visual fatigue and glaucomatous visual field damage. A retrospective analysis (PMC3429325, n=332 patients) found GBE improved visual function in normal-tension glaucoma patients versus controls. Its flavone glycosides and terpenelactones support blood flow to the optic nerve and retina, which is relevant to fatigue from prolonged screen use.
Lutein accumulates in the macular pigment and filters high-energy visible (blue) light emitted by screens. A 2025 randomized, double-blind, placebo-controlled trial (n=70, 6 months, 10 mg/day) published in Frontiers in Nutrition found significant improvements in tear film break-up time, photo-stress recovery time, and the Schirmer tear test in high screen users. A 2017 Nutrients study (24 mg/day, 12 weeks) also reported reduced visual fatigue in healthy adults with high screen exposure.
Omega-3 fatty acids (EPA and DHA) support the tear film and reduce ocular surface inflammation relevant to digital eye strain and dry eye associated with prolonged screen use. A 2023 PMC-published meta-analysis of 19 RCTs (4,246 patients) found significant improvements in tear film break-up time and dry eye symptom scores with omega-3 supplementation. They function via anti-inflammatory eicosanoid modulation and maintenance of meibomian gland lipid composition.
Vitamin A (retinol) is essential for the visual cycle: it is the precursor of 11-cis-retinal, the chromophore of rhodopsin and cone opsins required for phototransduction. Deficiency causes visual dysfunction including night blindness and impaired photoreceptor recovery. In the context of digital eye strain, adequate vitamin A status supports photoreceptor regeneration and tear film mucin production, which is relevant to screen-related ocular surface dysfunction.
Vitamin C (ascorbic acid) is present in high concentrations in the aqueous humor of the eye and serves as a primary antioxidant protecting the lens, cornea, and retina from oxidative damage, including that caused by blue light from screens. It was included as a core ingredient in the NIH's AREDS RCT (500 mg/day), which demonstrated a 25% reduction in AMD progression risk. Vitamin C supports collagen synthesis in the sclera and maintains corneal integrity.
Vitamin E (tocopherol) is a fat-soluble antioxidant that protects photoreceptor cell membranes from lipid peroxidation caused by oxidative stress, including blue light exposure from digital screens. It was a core component of the NIH AREDS formula (400 IU/day) that demonstrated a ~25% reduction in advanced AMD progression. A meta-analysis has suggested higher vitamin E intake reduces risk of age-related eye disease.
Zeaxanthin is a macular xanthophyll carotenoid that, together with lutein, comprises the macular pigment responsible for filtering blue light from digital screens. The 2025 Frontiers in Nutrition RCT (n=70, 6 months, 10 mg lutein + 2 mg zeaxanthin daily) in high-screen users demonstrated significant improvements in objective tear film and visual recovery measures vs. placebo. Zeaxanthin is the dominant isomer at the foveal center, where visual acuity is most critical.
Zinc is the most abundant trace mineral in the retina and is required for the enzymatic activity of retinal dehydrogenase, which converts vitamin A to retinal for phototransduction. It is a component of the AREDS and AREDS2 formulas, where high-dose zinc (80 mg/day) reduced AMD progression risk by ~25% in a large NIH-sponsored multicenter RCT. Zinc supports retinal metabolism and the visual processing relevant to digital eye fatigue.
Eyebright (Euphrasia spp.) has a centuries-long tradition in European herbal medicine for alleviating eye strain, eye inflammation, and visual fatigue. PeaceHealth notes its historical use for eye fatigue and vision disturbances, though WebMD and the German Commission E monograph indicate clinical evidence remains insufficient. A small human study found eye drops with eyebright improved eye inflammation from strain and irritation in 81% of participants.
Go back