I have been taking this supplement for quite a few years now and wouldn't want to be without it. When I started my vision was becoming blurred, hard to focus, very worrisome. Within a few weeks, that all cleared up and I could see fine. After a couple of years another ingredient was added, and after that I noticed my night vision was sharper. At my age, 72, most people need prescription glasses. I have only slight nearsightedness, so I use drugstore reading glasses, but still see very clearly otherwise. I wouldn't want to be without it. Thanks for this great supplement.