A person needs a lens of power -4.5 D for correction of her vision. What kind of defect in vision is she suffering from?

Myopia

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Ptosis

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Presbyopia

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Diplopia.

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Solution

The correct option is A Myopia
Negative sign of power of lens indicates that focal length of the lens used for correction is negative. This means that concave lens is used for correction. Concave lens is used for the correction of myopia and hence, the person is suffering from myopia.

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