Synopsis

Source of validity: Scientific
Rating (out of 5): 4

Hydroxypropyl cellulose (HPC) is scientifically validated as an ocular lubricant and is widely used in ophthalmology, primarily in the management of dry eye symptoms, which can include redness and itching. HPC is a semisynthetic, viscoelastic polymer that acts as a lubricant and tear substitute. It stabilizes the tear film and prolongs the contact time of tears on the ocular surface, thereby alleviating symptoms of ocular discomfort such as redness, irritation, and itching that arise from inadequate tear production or excessive tear evaporation. HPC is available in ophthalmic formulations, such as ocular inserts (Lacrisert) and eye drops.

Clinical studies have demonstrated the efficacy of HPC in reducing symptoms of dry eye syndrome. For example, randomized controlled trials have shown that HPC inserts significantly improve both subjective symptoms (such as itching and burning) and objective measures (such as tear film break-up time and corneal staining) compared to placebo. The product is approved by regulatory agencies (such as the FDA) for use as an ocular lubricant, supporting its scientific legitimacy.

While HPC does not directly treat the underlying causes of allergy-induced eye redness or itching, it can provide symptomatic relief in cases where irritation is due to dryness or environmental factors. Therefore, its use for "red or itching eyes" is scientifically grounded, particularly when these symptoms are related to dryness.

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