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Notes On Defects Of Eye

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Published in: Biology
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The notes will help students to get a knowledge about what are the Defects of Eey and their symptoms.

Asha A / Al Ain

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Qualification: M.Sc-Physics

Teaches: Physics, Science, Maths

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  1. Defects of vision and their correction Myopia Hypermetropia Presbyopia
  2. www7üve.in Myopia MYOPIA Eye lens Retina The light from a distant object aniving at the eye lens may get converged at a point in front of the retina in tho vitreous body. This type of defect is called near sightedness or
  3. Myopia correction MYOPIA Correction: Llght Rays Concave Lens Retina To wnpensate this, we interpose a mave lens between the eye and the object, with the diverging
  4. Myopia ' Definition - is a defect of vision in which a person can see nearby objects clearly but cannot see distant objects clearly because the image is formed in front of the retina Causes — Increase in curvature of the eye lens — Increase in the length of the eye ball Correction — Using concave lens
  5. Hypermetropia HYPERMETROPIA Hypermetropic Eye Light Rays m.7EIve.in Reti In the case of hypermetrqic eye, the light rays fm the object fall on the eye and fowses the
  6. Hypermetropia correction Correction Light Rays HYPERMETROPIA Convergent Lens WNW Retin A convergent lens is needed to compensate for the defect in vision.
  7. Hypermetropia ' Definition - is a defect of vision in which a person can see distant objects clearly but cannot see nearby objects clearly because the image is formed behind the retina. Causes Decrease in curvature of eye lens Shortening of the eye ball Correction Using a suitable convex lens
  8. Presbyopia corrected Image on the retina
  9. Presbyopia ' Definition- is a defect of vision in old people in which they are not able to see nearby and far objects clearly Causes — weakening of the ciliary muscles — decrease in the flexibility of the eye lens Correction — Using Convex lens

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