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प्रश्न
In bifocal lenses used for the correction of presbyopia ______.
पर्याय
the upper portion is of convex lens for the near vision and lower part is of concave lens for the distant vision.
the upper portion is of convex lens for the distant vision and lower part is of concave lens for the near vision.
the upper portion is of concave lens is for the near vision and lower part is of convex lens for the distant vision.
the upper portion is of concave lens for the distant vision and lower part is of convex lens for the near vision.
उत्तर
In bifocal lenses used for the correction of presbyopia the upper portion is of concave lens for the distant vision and lower part is of convex lens for the near vision.
Explanation:
To correct presbyopia, bifocal lenses have a diverging lens for far vision and a converging lens for near vision (e.g., reading). This design enables presbyopia patients to see distant and nearby objects using a single pair of glasses.
