The best eating tips and diet tricks to make healthy choices during one of the busiest times of year.
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.