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The Human Eye

The Human Eye. Comparing human eye to camera Hyperopia , Presbyopia & Myopia. Components of the Eye. Pupil. Iris. Iris. Pupil. Components of the Eye. Iris. Pupil. Cornea. Lens. Components of the Eye. Retina. Iris. Pupil. Cornea. Lens. Components of the Eye. Retina. Iris.

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The Human Eye

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  1. The Human Eye Comparing human eye to camera Hyperopia, Presbyopia & Myopia

  2. Components of the Eye Pupil Iris Iris Pupil

  3. Components of the Eye Iris Pupil Cornea Lens

  4. Components of the Eye Retina Iris Pupil Cornea Lens

  5. Components of the Eye Retina Iris Optic Nerve Pupil Cornea Lens

  6. Components of the Eye Image formed on retina will be smaller & inverted. You “see” with your brain Your brain will “flip” the image

  7. Eye Accommodation Ciliary muscles can change the shape of the lens slightly to accommodate focusing on distant & nearby objects.

  8. Hyperopia(Far-sightedness) Problem focusing on nearby objects. Due to either: • Distance between lens & retina are too small • Focusing power of cornea-lens combination is too weak  light is focused behind the retina Solution: Corrective converging lens (or positive meniscus)

  9. Presbyopia Also problem on seeing nearby objects. HOWEVER, this is due to aging  because lens lose their elasticity. Solution: Corrective converging lens.

  10. Myopia (Near-sightedness) Problem focusing on distant objects. Due to either: • Distance between lens & retina are too large • Focusing power of cornea-lens combination is too strong  light is focused in front of retina Solution: Corrective diverging lens (or negative meniscus)

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