I have been taking Advanced Vision formula for years, since it was originally called Sharper Vision formula. I was having blurred vision--scary--and within a month that disappeared. Later a new ingredient was added and the name changed, and I noticed further improvement in my vision. At my age everyone wears glasses, but I only need drugstore ones for reading small print. My night vision is sharp, distance vision great, and I am very grateful for this product. I'd be wearing expensive prescription glasses without it.