Question
The refractive error shown in the image below is?
| A. |
Hypermetropia
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| B. |
Myopia
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| C. |
Emmetropia
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| D. |
Astigmatism
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Show Answer
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Correct Answer � B
Explanation
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Ans.B. The given image shows Myopia.
Myopia or near-sightedness (short-sightedness) is one form of ametropia where the eye is effectively too long or has too high a power. Consequently, a point at infinity focuses in front of the retina. In myopia, a point lying between infinity and the eye is conjugate to the retina.
Hyperopia or far-sightedness is a form of ametropia where the eye’s power is too weak or the eyeball too short. In this case, a point at infinity focuses behind the retina. A point behind the eye is therefore conjugate to the retina.
Astigmatism is a form of ametropia in which refractive error changes with meridian.
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