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.

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.