The Delicate Structure of the Eye

Your eyes are very delicate. You can think of them as the color television cameras for your brain. Like a camera, your eyes include:

- A lens that focuses light; 
- An iris that controls the amount of light that enters the   eye; 
- Receptors that "pick up" the image of what you see,   and; 
- An optic nerve that serves as a "cable" to transmit   information from the receptors in your eye to your   brain.

Unlike a television camera that is made of plastic and metal, your eye is made of soft tissues and blood vessels. Damage your eyes, and you have big trouble. Trouble that is often permanent.