Learn how to promote and maintain healthy joints at any age with these healthy tips from Dr. Oz.
This animation by Visible productions explains the process by which we see and how imperfections in the cornea result in nearsightedness, farsightedness and astigmatism. It also shows how lasik surgery is performed to correct these conditions.
To view an animation that explains how aging affects our vision, click here.
To learn what causes cataracts, and how they are normally treated, click here.