Eyesight

=__Eyesight__=




 * Eyesight** is one of the most important senses. In less than a second we see colors, shapes, and distances.

Eye Color

 * Eye color is determined by a number of genes in DNA.
 * It is a common mistake to believe that there is one gene that determines eye color.
 * There are many different colors of eyes: black, brown, blue, hazel and more.

Parts of the Eye

 * **Lens**//:// The lens focuses light. It is able to change shape to allow focus on near objects.
 * **Pupil**//:// This is the opening in the middle of the iris. It expands and contracts to adjust for brightness.
 * **Retina**//:// This is a thin layer of nerve tissue that senses light.

Eye Health
Almost 160 million need glasses. The image they see are fuzzy. Millions of people fix their eyesight each year playing video games. Playing video games is the worst thing for eye health.

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