EYE Kim Lachler Updated 2015 NCES: 6.P.1.2.

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Presentation transcript:

EYE Kim Lachler Updated 2015 NCES: 6.P.1.2

How we see. Your eyes are designed to detect the visible light of the electromagnetic spectrum The_Human_Eye.mov

How we see. Light refracts (bends) as it passes through the cornea. The membrane that protects the eye. (Note: the white part of the eye is called the sclera)

How we see. Light then pass through the pupil. Pupil The opening in the eye. It appears black It does not change size.

How we see. The size of the pupil is controlled by the iris. Iris It is the colored part of the eye. It gets smaller when it is dark to allow more light to enter the eye.

How we see. The eye focus an image on the back of the eye with the lens. Lens Convex shape. Refracts light to the back of the eye.

How we see. Light is detected by receptors in the retina. Retina Back surface of the eye Contains rods and cones. Rods are on the outer surface and detect shadows and movement. Cones are on the center surface and detect color.

How we see. It is converted to electrical signals carried to the brain by nerves. Optical nerve Carries the information to the brain.

Eye Problems Nearsightedness Person is able to see things clearly that are close but not far. Result of the lens focuses objects in front of the retina instead of on it. Concave lens glasses correct the problem. (Curved in)

Eye Problems Farsightedness Person is able to see things clearly that are far but not close. Result of the lens focuses objects behind the retina instead of on it. Convex lens glasses correct the problem. ( Curved out)

Eye Problems Color Blindness The cones do not work properly. Usually have the most trouble with red and green. 5-8% of all men and .5% of all women have it.

Bibliography Holt, Rinehart, Winston, North Carolina Holt Science & Technology, Holt, Rinehart, Winston, Orlando, 2005 Google images, googleimages.com, accessed 2011