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T




    To be nearsighted
Definition
 If you are nearsighted, objects in the distance appear
  blurry and out of focus.
 Most nearsightedness is caused by a natural change in
  the shape of the eyeball. Less often, nearsightedness
  may be caused by a change in the cornea or the lens.
  The change in shape causes light rays that enter the
  eye to focus in front of the retina rather than directly
  on it, which leads to blurred vision.
Symptoms
 In low myopia, the only symptom is indistinct distant
 vision. In high myopia, in addition to distance
 problems, there is also a problem for near work, simply
 because the object has to be held very close to the
 eye, which causes a strain on the convergence
 mechanism of the eye
Causes
 The exact cause of nearsightedness is unknown, but
  two factors may be primarily responsible for its
  development:
 heredity
 visual stress
 There is significant evidence that many people inherit
  nearsightedness, or at least the tendency to develop
  nearsightedness. If one or both parents are
  nearsighted, there is an increased chance their
  children will be nearsighted.
Treatment
 treating nearsightedness has to do with orthokeratology , also known
  as corneal refractive therapy. It is a non-surgical procedure that
  involves wearing a series of specially designed rigid contact lenses to
  gradually reshape the curvature of your cornea. The lenses place
  pressure on the cornea to flatten it. This changes how light entering the
  eye is focused.
Prevalence
 Nearsightedness is a very common vision condition
  affecting nearly 30 percent of the U.S. population.
  Some research supports the theory that
  nearsightedness is hereditary.
 Generally, nearsightedness first occurs in school-age
  children. Because the eye continues to grow during
  childhood, it typically progresses until about age 20.

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Myopia

  • 1. T To be nearsighted
  • 2. Definition  If you are nearsighted, objects in the distance appear blurry and out of focus.  Most nearsightedness is caused by a natural change in the shape of the eyeball. Less often, nearsightedness may be caused by a change in the cornea or the lens. The change in shape causes light rays that enter the eye to focus in front of the retina rather than directly on it, which leads to blurred vision.
  • 3. Symptoms  In low myopia, the only symptom is indistinct distant vision. In high myopia, in addition to distance problems, there is also a problem for near work, simply because the object has to be held very close to the eye, which causes a strain on the convergence mechanism of the eye
  • 4. Causes  The exact cause of nearsightedness is unknown, but two factors may be primarily responsible for its development:  heredity  visual stress  There is significant evidence that many people inherit nearsightedness, or at least the tendency to develop nearsightedness. If one or both parents are nearsighted, there is an increased chance their children will be nearsighted.
  • 5. Treatment  treating nearsightedness has to do with orthokeratology , also known as corneal refractive therapy. It is a non-surgical procedure that involves wearing a series of specially designed rigid contact lenses to gradually reshape the curvature of your cornea. The lenses place pressure on the cornea to flatten it. This changes how light entering the eye is focused.
  • 6. Prevalence  Nearsightedness is a very common vision condition affecting nearly 30 percent of the U.S. population. Some research supports the theory that nearsightedness is hereditary.  Generally, nearsightedness first occurs in school-age children. Because the eye continues to grow during childhood, it typically progresses until about age 20.