Diabetic Retinopathy Functional Evaluation Study: Monitoring Carotenoid Vitamins Treatment Using ERG

Oral supplement. Each subject will be given the carotenoid supplement of DVS formula. The DVS formula consists of vitamins C, D3 and E (d-α tocopherol), zinc oxide, eicosapentaenoic acid, docosahexaenoic acid, α-lipoic acid (racemic mixture), coenzyme Q10, mixed tocotrienols/tocopherols, zeaxanthin, lutein, benfotiamine, N-acetyl cysteine, grape seed extract, resveratrol, turmeric root extract, green tea leaf, and Pycnogenol (patented French Maritime Pine Bark extract, sp Pinus pinaster, Horphag Research, Geneva, Switzerland). Supplements bottles will be labelled with a unique identification number for each subject and supplied by ZeaVision, LLC, Chesterfield, Missouri, USA. To assure that the participants do not have any issues with the vitamin supplement and to ensure adequate adherence to schedule of vitamin intake the participants will get regular phone calls from the study investigators (once every two weeks).