What is Astigmatism ??
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1. An eye defect in which observer cannot focus clearly on objects at any distance. The cause of astigmatism is the non-spherical Cornea. This defect can be corrected by using cylindrical lens of suitable curvature.
2. The defect of an optical system such as a lens or a mirror in which the horizontal and
vertical objects at the same distance from the lens are not focussed simultaneously.
1. An eye defect in which observer cannot focus clearly on objects at any distance. The cause of astigmatism is the non-spherical Cornea. This defect can be corrected by using cylindrical lens of suitable curvature.
2. The defect of an optical system such as a lens or a mirror in which the horizontal and
vertical objects at the same distance from the lens are not focussed simultaneously.
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Hi friend_______,
★ In this defect, the eye cannot see parallel and horizontal lines clearly.
★ It may be inherited or acquired.
★ It is due to the imperfect structure of eye lens due to the development of cataract on the lens, ulceration of cornea, injury to the refracting surfaces etc..
★ It is corrected by cylindrical lenses (Torrid lenses).
Thank you..
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