CBSE Class 10 Answered
What is Astigmatism
Asked by Samiksha Srivastava | 13 Dec, 2013, 04:58: PM
Expert Answer
Astigmatism is an eye condition with blurred vision as its main symptom. The front surface of the eye (cornea) of a person with astigmatism is not curved properly - the curve is irregular - usually one half is flatter than the other - sometimes one area is steeper than it should be.
When light rays enter the eye they do not focus correctly on the retina, resulting in a blurred image. Astigmatism may also be caused by an irregularly shaped lens, which is located behind the cornea.
The two most common types of astigmatism are:
- Corneal astigmatism - the cornea has an irregular shape.
- Lenticular astigmatism - the lens has an irregular shape.
Correction: Astigmatism can be corrected by using cylindrical lenses. They have different curvatures in horizontal and vertical directions and so they can be oriented suitably to compensate for the irregularities in the cornea.
Answered by Faiza Lambe | 13 Dec, 2013, 06:18: PM
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