Evidence supporting the use of: Camellia sinensis
For the health condition: Glaucoma

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Synopsis

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

Camellia sinensis, the plant source of green and black tea, has been investigated for its potential effects on intraocular pressure (IOP), which is a key risk factor in glaucoma. Several studies have shown that the caffeine content in tea can cause a transient increase in IOP, but there is also evidence suggesting that the polyphenols, particularly epigallocatechin gallate (EGCG), found in green tea may have neuroprotective and antioxidant effects that could be beneficial for the optic nerve in glaucoma patients. Epidemiological studies, however, have not consistently demonstrated a clear link between tea consumption and reduced glaucoma risk. Some small clinical studies have reported short-term reductions in IOP following green tea consumption, but these effects are mild and not sustained. Overall, while there is preliminary scientific interest and some laboratory data suggesting possible benefits, high-quality clinical evidence supporting the use of Camellia sinensis for treating or preventing glaucoma is limited. Most guidelines do not recommend tea or its extracts as a primary or adjunctive treatment for glaucoma. The evidence, therefore, is weak (rated 2 out of 5), reflecting early-stage research rather than established clinical practice.

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