I have been wearing pmma lenses for almost 30 years without problems. My eye doc. insists that I should not go with another set of pmma. That I would start having problems and that there were studies that suggested that pmmas cause damage etc. I have tried the rgp lenses in the past and was never very happy about the sharpness and clarity. What's the word on pmma lenses. Are they going to cause damage to my eyes?