Figure shows two defects of the eye. Describe the causes of short-sightedness and long-sightedness. Use information from Figure 12 to help with your answer – 10008

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1. Short-sightedness (Myopia)
   1. In a person with short-sightedness, the eyeball is too long.

   2. Or, their cornea or lens is too curved (too convex).

   3.Because of this, light is bent (refracted) too much as it enters the eye.

   4.As a result, the light rays are focused in front of the retina instead of directly on it.

   5.This means distant objects appear blurry because the image is formed before the retina.

   6.People with myopia often need concave lenses in their glasses to spread out the light rays before they enter the eye.

   Long-sightedness (Hyperopia)
   1. In a person with long-sightedness, the eyeball is too short.

   2. Or, the cornea isn’t curved enough or the lens is too thin (not convex enough).

   3. This causes light to bend too little as it passes through the eye.

   4. The light rays end up being focused behind the retina, not on it.

   5. As a result, near objects appear blurry, because the image forms after the retina.

   6.People with hyperopia usually wear convex lenses to help bend the light more before it enters the eye.

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