alleryAn old man cannot read a book held close but can see distant scenes clearly. The defect and its cure are:
AMyopia, concave lens corrects
BPresbyopia, bifocal needed
CAstigmatism, cylindrical lens
DHypermetropia, convex lens corrects
Answer & Solution
Correct answer: D. Hypermetropia, convex lens corrects
1. Inability to see NEAR objects = hypermetropia (or its variant in old age, presbyopia).
2. The eye lens has lost flexibility and the near point recedes.
3. CONVEX lens of suitable focal length brings near objects into focus on the retina.
4. If BOTH near and far vision are affected, bifocal lenses are prescribed.
_Source: syllabus Science Ch 10 §10.2 Hypermetropia_
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