Just so you know... If your problem is an astigmatism diopter may not do the trick. It depends on how severe the astigmatism is. If your probem is all astigmatism diapter alone won't solve the problem. its also a matter of axis. for people with an astigmatism the world is blurry both close and far. If you are just near or far sited diopter will work. Talk to your eye doctor and they can explain it better than I can write it. I have a severe astigmatism and I can see clearly without my glasses at any distance. Plus I was an optician for 12 years (the one who makes the glasses). Magick Michael