I read an article about a woman who had new glasses and had nothing but problems. Got headaches, etc and went kept going back to the optometrist (for over a year) to find out what was wrong. Turned out that the lenses were a new style and were completely flat. Our eyes are round and our lenses need to be curved and the optometrist didn't know this???????? The woman ditched her flat lenses, got curved ones and all of her problems miraculously resolved.