Astigmatism occurs when...

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(D) Astigmatism is a common vision condition caused by an irregular shape of the cornea or the lens. In a normal eye,the cornea and lens are curved eq

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The curvature of the cornea changes.

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(D) Astigmatism is a common vision condition caused by an irregular shape of the cornea or the lens. In a normal eye,the cornea and lens are curved equally in all directions,allowing light to focus sharply on the retina. In astigmatism,the cornea or lens is curved more in one direction than the other,which prevents light from focusing properly on the retina,leading to blurred or distorted vision. Therefore,the correct answer is that the curvature of the cornea changes (or is irregular).

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