Correcting Vision Problems Using Lenses - Refractive Errors

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7 Terms

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Hyperopia Definition (Farsightedness)

  • A common vision condition in which you can see distant objects clearly, but objects nearby may be blurry.

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Hyperopia Causes

  • Caused by an eyeball that is too short and a cornea that is too flat.

  • Light rays from nearby object diverge more strongly than the ones from faraway objects.

  • The light rays focus at a point behind the retina.

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Hyperopia Corrections

  • Using convex lenses

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Myopia Definition (Nearsightedness)

  • Can see objects that are close, but not far away.

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Myopia Causes

  • Happens when light rays focus in front of the retina.

  • Caused by an eyeball that is too long, and a cornea with too much curvature.

  • Diverging lenses cause the light from distant objects to diverge as they approach the eye.

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Myopia Corrections

  • Corrected by concave lenses.

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Astigmatism Definition

  • Occurs when the cornea or lens of the eye is irregularly shaped, causing light to focus unevenly on the retina. This leads to blurred or distorted vision.

  • Light entering the eye from different directions is focused on different amounts.