Synopsis

Source of validity: Traditional
Rating (out of 5): 2

Tannins are a class of polyphenolic compounds found in many plants, and their astringent properties have been recognized in traditional medicine systems for centuries. In the context of conjunctivitis (inflammation of the conjunctiva of the eye), tannin-containing plant extracts (such as those from witch hazel, tea, or oak bark) have historically been used as topical washes or compresses with the aim of reducing inflammation, soothing irritation, and exerting antimicrobial effects. The rationale behind their use is largely based on tannins’ ability to precipitate proteins and form a protective layer on mucous membranes, which may provide symptomatic relief.

However, the scientific evidence supporting the use of tannins—particularly unspecified or crude tannin preparations—for conjunctivitis is limited and mostly anecdotal. There are few, if any, rigorous clinical trials evaluating their efficacy or safety for this specific condition. Modern ophthalmology generally does not recommend tannins for conjunctivitis, and there are concerns about the potential for ocular irritation or allergic reactions. Nevertheless, the historical use of tannin-containing eye washes is well documented in various traditional medicine texts. In summary, the use of tannins for conjunctivitis is primarily justified by historical and traditional practices rather than robust scientific validation.

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