________ lens is used to correct the defect of vision termed as prebyopia.
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A convex lens is used to correct presbiopia. The design of the glasses you make would determine if you use bifocal glasses, Progressive glasses or only near vision glasses. In only near vision glasses, only convex lens is fitted but if the same glass is used for seeing a distant object, the vision is blurred.
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Explanation:
Biofocal lens
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