The AREDS2 supplement is only recommended for patients with the intermediate or advanced stages of AMD. The AREDS2 study did not find an added benefit of 80 mg zinc per day when compared with 25 mg zinc per day. Systane AREDS2 I-Caps contain the lower amount of zinc whereas the PreserVision AREDS2 supplement contains the higher amount. I-Caps are sold by Walgreens.
https://www.nei.nih.gov/research/clinical-trials/age-related-eye-disease-studies-aredsareds2/aredsareds2-frequently-asked-questions