Squat with dumbbell exercise for leg muscles

Chest press with dumbbell

The chest press with dumbbell exercise targets the chest muscles. See how it's done.

Bent-over row with resistance tubing

The bent-over row with resistance tubing targets the back of the shoulder. See how it's done.

Cornea transplant

Video shows how full-thickness and partial-thickness cornea transplants are performed.

Macular degeneration

This animation shows the process of macular degeneration in the eye. The macula is the part of the retina that distinguishes fine details at the center of the field of vision. Macular degeneration results from a partial breakdown of the insulating layer between the retina and the choroid layer of blood vessels behind the retina. Macular degeneration results in the loss of central vision only.

• Vision

Need to relax? Take a break for meditation

Spend a few minutes on stress reduction with this guided meditation video.