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Question
Fill in the blanks:
An aged person suffering from __________, caused by the weak accommodation power of the eye lens associated with old age, should wear _________ lenses.
Fill in the blanks:
An aged person suffering from __________, caused by the weak accommodation power of the eye lens associated with old age, should wear _________ lenses.
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Solution
The correct option is C Presbyopia, bifocal
Correct answer (a)
The power of accommodation of the eye usually
decreases with ageing. For most people, the near point
gradually recedes away. They find it difficult to see
nearby objects comfortably and distinctly without
corrective eye-glasses. This defect is called Presbyopia.
It arises due to the gradual weakening of the ciliary
muscles and diminishing flexibility of the eye lens.
Sometimes, a person may suffer from both myopia and
hypermetropia. Such people often require bi-focal lenses. The upper portion consists of a concave lens. It facilitates distant
vision. The lower part is a convex lens. It facilitates near vision.
Correct answer (a)
The power of accommodation of the eye usually
decreases with ageing. For most people, the near point
gradually recedes away. They find it difficult to see
nearby objects comfortably and distinctly without
corrective eye-glasses. This defect is called Presbyopia.
It arises due to the gradual weakening of the ciliary
muscles and diminishing flexibility of the eye lens.
Sometimes, a person may suffer from both myopia and
hypermetropia. Such people often require bi-focal lenses. The upper portion consists of a concave lens. It facilitates distant
vision. The lower part is a convex lens. It facilitates near vision.
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