The front of your eye is a clear window called the cornea. A thin, see-through layer of cells covers it, like a skin you can see through.
Drag to turn it around. Use the buttons to zoom in and try things from the lessons.
The 3D model can't load right now. Check your internet connection, or try a different web browser.
Look at someone's eye from the side. The clear dome over the colored part is the cornea, your eye's front window.
Its outside is covered by a few thin layers of clear cells. New cells grow at the bottom. Older cells move up, get flatter, and are rubbed off by blinking. Then new cells take their place.
The cornea is packed with tiny nerve endings, which makes it one of the most sensitive spots on your body.
Press Feel a speck on the 3D model. That's why even a tiny eyelash in your eye feels huge! Never rub hard. Blinking and tears are the best way to wash it out.
The cornea has no blood vessels at all. Blood is red, and it would block the view. Instead, these cells get oxygen right from the air!