Below is a link to the American Optometric Association website for further information about eye conditions. Many of the explanations have nice videos that go along with the explanations. 

American Optometric Association Education Website  

 Also, Dr. Quaranta scans the ophthalmic and optometric literature daily to be aware of current research in eye care.  He summarizes daily the most pertinent and interesting studies on his Interesting Eye News blog.  Unfortunately, this blog is for eye care practitioners and is written in doctor "lingo".  But if you have any questions, feel free to call Dr. Quaranta at  480-812-2211 .

You may also search for conditions on Dr. Quaranta's  Sonoran Desert Eye Photo Blog.