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प्रश्न
State the nature (converging/diverging) of the upper part of presbyopia lenses.
लघु उत्तरीय
उत्तर
The upper portion of bifocal lenses is diverging. The upper part diverges for distant vision, whereas the lower part converges for near vision. This design enables persons with presbyopia to use a single pair of glasses to correct distance and near vision.
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