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 A is critical for vision as an essential component of rhodopsin, a protein that absorbs light in the retinal receptors, and because it supports the normal differentiation and functioning of the conjunctival membranes and cornea [2-4].
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.