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.

Sponsored by Abbott Medical Optics - for more information click here. Animation produced by Visible Productions Inc.

You've heard of red wine and white wine but have you ever heard of blue wine? This blue version of wine is given a taste test to see how it compares to the classics.