Explanations and videos of visual conditions such as nearsightedness, farsightedness, and astigmatism, as well as eye diseases such as cataracts and macular degeneration can be found here.
(After having gone to my eye doctor twice to check that my prescription was correct), I had my glasses re-made according to your prescription and I no longer need to read in large print. I am comfortable using the computer and can read 12-point font. I am so appreciative of your help and concern and expertise. Life is “lookin’ good” (pun intended). Thank you very much.