Zymaxid can be expensive if you don't have health insurance, prices at local pharmacies can vary greatly, but be prepared to pay as much as $100 for a 2.5ml bottle size of zymaxid 0.5 eyedrops.
Vitamin C helps with long term healthy vision support. Vitamin E helps with long term healthy vision support. R- Alpha lipoic acid is a powerful antioxidant that enhances glucose use in brain and eye cells. Usually a dose of 10 to 50 mg of R-Alpha lipoic acid can have a positive influence on vision.
However, taking all-rac-alpha-tocopherol (synthetic vitamin E) does not seem to have any benefit for people with Parkinson's disease. Laser eye surgery (photoreactive keratectomy). Taking high doses of vitamin A along with vitamin E (alpha-tocopheryl nicotinate) daily seems to improve healing and vision in people undergoing laser eye surgery.