I have to have my Sight Power every day along with Vita Vision 700. If I don't use them, I get floaters in my eyes. I just had my checkup and am going on 4 years with the same glasses. I take 4 Sight Power in the morning and 4 at night, along with a Vita Vision 700. If it were cheaper, I would take one or two in the morning also, but this amount works fine. I am past 90, so feel grateful for my good health, thanks to Healthy Way's products.