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The condition in which lines in one direction appear to be well focused while those in perpendicular direction appear distorted is known as ___________

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The condition in which lines in one direction appear to be well focused while those in perpendicular direction appear distorted is known as ___________

(a) Presbyopia

(b) Myopia

(c) Hypermetropia

(d) Astigmatism

I had been asked this question in final exam.

Asked question is from Optical Instruments in section Optics of Engineering Physics II

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The correct answer is (d) Astigmatism

Explanation: Astigmatism occurs when the cornea is not spherical. Due to this, lines in one direction seems to be focused while in the perpendicular direction looks distorted. It can be corrected by the use of cylindrical lenses.

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