http://www.ncbi.nlm.nih.gov/en...&itool=pubmed_docsum


"The results of this study provide a substantial basis for further evaluation of NAC in the treatment and prevention of vision impairment in the older population of drivers for legal driving. The developed ophthalmic drug NAC formula showed potential for the non-surgical treatment of age-related cataracts."


(This is N-acetyl-carnosine, not N-acetyl-cysteine, although the latter shows preventive benefits in animal models)

And here is a link to the product in the eye-drop form being recommended by doctors:


http://store.yahoo.com/iherb/eyedclare.html