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When You Open Your Eyes by Celeste Conway download in pdf, ePub, iPad

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Next time you sit in the dark theater, look behind you at the stream of light coming from the projection booth. And speaking of fluttering, don't forget eyelashes. These are blood vessels, the tiny tubes that deliver blood, to the sclera. Try looking away from your computer and focusing on something way across the room.

This space is filled with a special transparent fluid that nourishes the eye and keeps it healthy. When you look at things up close, the lens becomes thicker to focus the correct image onto the retina. Together, these cones can sense combinations of light waves that enable our eyes to see millions of colors. The vitreous body forms two thirds of the eye's volume and gives the eye its shape.

Think of the optic nerve as the great messenger in the back of your eye. The lid helps keep the eye clean and moist by opening and shutting several times a minute.

This is called blinking, and it's both a voluntary and involuntary action, meaning you can blink whenever you want to, but it also happens without you even thinking about it. Wear eye protection when playing racquetball, hockey, skiing, or other sports that could injure your eyes.

As adults get older, their eyes lose the ability to focus well and they often need glasses to see things up close or far away. Doctors use special microscopes to look at these inner parts of the eye, such as the lens.