Which of the following conditions cannot be corrected by using a correcting lens?

astigmatism

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night blindness

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cataract

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colourblindness

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Solution

The correct options are
B cataract
C night blindness
D colourblindness
A correcting lens is used to correct defects of eye caused by loss of power of accommodation. Astigmatism is such a defect.
Night blindness, cataract and colour blindness are caused due to nutrient deficiency.

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