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The Eye

The Eye. Diagram of the Eye. Functions for the Parts of the Eye. Cornea – transparent outer surface of the eye that protects the eye and helps to focus the light Pupil – a hole that allows light to enter the eye

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The Eye

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  1. The Eye

  2. Diagram of the Eye

  3. Functions for the Parts of the Eye • Cornea – transparent outer surface of the eye that protects the eye and helps to focus the light • Pupil – a hole that allows light to enter the eye • Iris – a circular band of muscle that controls the size of the pupil, and therefore, controls the amount of light that enters the eye

  4. Functions continued • Lens – a convex lens that focuses the light to form an image on the retina • Retina – the inner lining at the back of the eye that as as a projection screen for the light entering the eye • Optic nerve – sends messages to the brain about the image

  5. Creating the Image • The human EYE gathers LIGHT from objects • In a healthy eye, a SMALLER, INVERTED, REAL image of an object is created on the RETINA at the back of the eye. • ELECTRICAL IMPULSES from the eye travel through the OPTIC NERVE to the BRAIN. • The brain ROTATES the image RIGHT SIDE UP.

  6. The Image on the Retina

  7. Focusing the Image • Eye MUSCLES change the SHAPE of the eye LENS. • This makes it possible to create a sharply FOCUSED image on the retina if an object is distant or nearby. Lens is more spherical Lens is flatter

  8. Eye Problems - Myopia • Myopia is near-sightedness • can see nearby objects clearly • distant objects appear out of focus because the light rays meet in front of the retina Myopia Normal

  9. Correcting Myopia • A DIVERGING LENS can correct myopia by SPREADING out the incoming LIGHT RAYS before they enter the eye

  10. Eye Problems – Hyperopia • Hyperopia is far-sightedness • Can see distant objects • Near by objects are not focused because light rays meet at an imaginary point behind the retina

  11. Correcting Hyperopia • Converging lens can correct hyperopia by refracting rays so that the meet at the retina instead of behind it

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