In old age a bifocal lens is necessary for a person. In bifocal lens, the upper part is concave lens to correct myopia and lower part is convex lens to correct ____.

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Detailed Solution

Concept: In bifocal lens, the upper part is concave lens to correct myopia and lower part is convex lens to correct hypermetropia. In old age a bifocal lens is necessary for a person. In bifocal lens, the upper part is concave lens to correct myopia and the lower part is convex lens to correct hypermetropia.
The basics of the human eye and understanding of the numerous disorders affecting human eyesight can be used to tackle the aforementioned issue. Additionally, the theory behind diseases and their ideal treatment can be used in such circumstances.
The different body parts' ability to perform often deteriorates with age due to their inefficiency. Similar to this, as people age, their eyesight deteriorates and they become more susceptible to myopia and hypermetropia, among other vision-related disorders. Concave lenses can be used to treat myopia, while convex lenses are used to treat hypermetropia. As a result, an elderly person who has both myopia and hypermetropia needs a bifocal lens, with the lower part being made of a convex lens to correct hypermetropia and the top part being made of a concave lens to fix myopia.
Hence, the answer is Hypermetropia.

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