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For dry AMD (age-related macular degeneration), the recommendations mostly include AREDS2 (Age-related Eye Disease studies 2) formulation. The other recommendations are quitting smoking (in case of smokers), controlling hypertension, lipid level, diabetes, and regular checking with an Amsler chart to pick early conversion of dry AMD into wet AMD. Your decrease in vision over five years may be due to lens changes or cataracts; you have not mentioned the cataract surgery done or not. If there is no fluid or change on Amsler, then AREDS and other preventive measures are enough. Trials are underway on Fenretinide as that decreases cytotoxins production in the retina. The other trials being done include Saffron 20 mg/day. The evidence suggests that it is neuroprotective but needs more research and authentic results. These are still under trial, and there are no recommendations available. More treatment options are available for wet AMD as it is a vision-threatening condition. There are intravitreal injections and lasers (PDT- photodynamic therapy) options.
I would advise you to stick with the current therapy of AREDS and keep testing with Amsler. Keep in touch with your eye doctor about any new modality introduced for dry AMD. He will inform you.
Dry AMD.Treatment plan:
AREDS and keep testing with Amsler.Preventive measures:
Stop smoking, control BP, blood sugar and lipid level.