CNN — When humans finally have the chance to explore Mars, the members of those crewed missions will be millions of miles from home with delayed communications. Before they go, scientists want to ...

The human eye is a remarkably complex organ controlled by six cranial nerves. The third cranial nerve (CN III) is commonly called the oculomotor nerve. This nerve enables many vital eye movements and ...

Q: What do I expect when I have cataract surgery? A: The human eye functions like a camera. The lens inside the eye focuses the images onto the retina so we can see. So, when the lens becomes cloudy, ...

When humans finally have the chance to explore Mars, the members of those crewed missions will be millions of miles from home with delayed communications. Before they go, scientists want to understand ...