A graphic animation of what causes fat and sagging eyelids. The video describes what takes place during eyelid surgery (blepharoplasty).

Most laser vision correction procedures like LASIK involve shaping the cornea so that light can be properly focused on the back of the eye, or retina. This video shows how the anatomy of the eye works to harness light so that we can see. The role of the cornea in vision is also discussed.

Crisp images from our world require that light is focused on the back of the eye. When light cannot focus properly, it is called an error of refraction and is often caused by an irregular or improperly shaped cornea. LASIK improved errors of refraction in the eye by reshaping the cornea, as the animation explains.

This narrated animation explains the goals and benefits of eyebrow surgery or blepharoplasty. It also describes the possible surgical approaches used in blepharoplasty.