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.
Older Age- the skin is less able to convert sunlight into vitamin d. Being very large or obese- you simply require more vitamin d the larger you are. Having Low Cholesterol Levels- cholesterol is required to convert sunlight to vitamin d in the skin. Eating a very low fat diet- vitamin d is fat soluble and you must have fat to absorb it. Having very dark skin- blocks the UV rays from reaching the cells that make vitamin d in the skin.