For the last several years I have used cheap $store and WM readers because I'm horrible about loosing them and didn't want to invest in real galsses but my husband finally talked me into going to get eye exam and "real' glasses because I was having more trouble seeing. I was shocked to learn my eyesight wasn't going just because of age but I had contracted a diesase called " ocular histoplasmosis " from fungus,"histoplasmosis capsulatum" in bird droppings,most likely suspect were the chickens we use to raise.This fungus is also found in other birds such as piegons and also bat droppings and you can even get it just by driving down a road by chicken houses.Luckily it treatable w/ lazer surgery but if left untreated you can go blind and worst case senario is removal of affected eyeball(s). SO...don't neglect your vision health. I go to specialist Sat. for second opion and coarse of treatment.