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CBSE Class 10 Answered

what is presbyopia and astigmatism?
Asked by | 22 Feb, 2012, 07:40: PM
answered-by-expert Expert Answer
Presbyopia:-A form of optical distortion affecting the vision of patients, particularly those of advancing age. It depends on diminution of the power of the accommodation of the lens as a result of loss of elasticity of the crystalline lens, causing the near point of distinct vision to be removed farther from the eye.
Astigmatism:- this defect of vision arises when cornea of the eye has different curvature in different directions as a result an astigmatic person would find variation in intensity of light.
Answered by | 22 Feb, 2012, 08:19: PM

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