“Lowers intraocular pressure to improve glaucoma and cataracts.” “Prevents macular degeneration.” “Formulated by medical specialists.” These bold promises appear routinely across online advertisements and social media posts for eye supplements. For consumers worried about declining vision, such claims can be difficult to ignore. However, leading medical experts warn that promises regarding the prevention or reversal of conditions such as glaucoma, cataracts, and macular degeneration are not only scientifically unfounded but blatantly false.
In an interview with healthcare news outlet Comedydotcom, Kim Chan-yoon, board chair of the Korean Ophthalmological Society and an ophthalmology professor at Yonsei University Severance Hospital; Chung Hye-wook, president of the Korean Ophthalmologists Association; and Choi Mi-young, president of the Korean Association for Pediatric Ophthalmology and Strabismus and an ophthalmology professor at Chungbuk National University Hospital, forcefully debunked these commercial claims. The specialists characterized assertions that dietary supplements can prevent or treat major ocular diseases as "blatantly false and exaggerated advertising," urging the public not to fall for marketing tactics designed to exploit patient anxiety.
Glaucoma: Only Lowering Intraocular Pressure Slows Progression
Glaucoma is a progressive disease in which the optic nerve suffers gradual, irreversible damage. To date, the only medically proven method to slow its progression is lowering intraocular pressure. Kim Chan-yoon, who previously served as president of the Korean Glaucoma Society, emphasized that once optic nerve tissue is damaged, it cannot be restored through oral supplements. While legitimate prescription medications exist to lower intraocular pressure, ingredients commonly featured in supplement "miracle cures"—such as bilberry and saffron extract—have no effect on eye pressure.
Cataracts: Clouded Lenses Require Surgical Intervention
Cataracts similarly cannot be reversed or cured through dietary supplements or oral medications. The condition involves the gradual clouding of the eye’s natural lens due to protein breakdown—a process closely analogous to hair turning gray with age. While certain prescription eye drops may slightly slow early progression, Kim Chan-yoon noted that no pill or supplement can clear a lens that has already become opaque. Currently, surgical replacement of the lens remains the sole definitive treatment for cataracts.
Macular Degeneration: AREDS2 Formulations Do Not Prevent Disease
Questions also surround popular supplements containing lutein and zeaxanthin, ingredients widely advertised for macular health. The landmark AREDS2 study, conducted by the U.S. National Eye Institute, demonstrated that a specific combination of nutrients—including lutein, zeaxanthin, vitamins C and E, zinc, and copper—can slow disease progression. However, this protective benefit applies exclusively to individuals who already have intermediate or advanced dry macular degeneration, reducing their risk of progressing to the vision-threatening wet form by approximately 25 percent.
Chung Hye-wook stressed that these formulations do not prevent macular degeneration in healthy individuals, nor do they benefit patients with early-stage disease or those who have already developed wet macular degeneration. Furthermore, Kim Chan-yoon clarified that the AREDS2 formula is categorized as a functional health food rather than a medical treatment, offering no capability to restore lost vision.
Evaluating Medical Claims and Endorsements
The experts also urged consumers to critically evaluate medical endorsements featured in supplement marketing. Chung Hye-wook advised verifying whether an endorsing physician's full name, specific institutional affiliation, and professional credentials are clearly stated and verified by reputable bodies like the Korean Ophthalmological Society. Vague descriptions such as "developed by a famous specialist" or "recommended by a U.S. doctor" should be viewed as major red flags.
Choi Mi-young added that practicing clinical physicians do not promote commercial supplements using such tactics, stressing that consumers must learn to navigate online health claims critically to protect both their vision and their financial well-being.
