This provides a very detailed, step-by-step animation of how cataract surgery is performed. It also show how an intraocular lens or IOL is inserted after the natural lens is removed in the cataract surgery shown.

This video shows how vision is dependent on light entering the front of the eye and focusing on the retina at the back of the eye. When this focus cannot be accomplished by the eye muscles or lens of the eye, it results in nearsightedness or farsightedness. Sometimes changes in the cornea can correct these errors of refraction.

Any object that we see is a collection of light energy focused on the retina. The lens of the eye helps us see near and far things equally well. This animation describes how the lens of the eye changes to accommodate and focus light.

This narrated animation describes the function of the major structures of the eye, namely the pupil, iris, lens, cornea, and retina.