Which defect of vision occurs due to the weakening of ciliary muscles with age?
-
A.
Myopia
-
B.
Astigmatism
-
C.
Presbyopia
-
D.
Hypermetropia
Correct Answer:
C. Presbyopia
Explanation:
Presbyopia is an age-related vision defect caused by the gradual weakening of the ciliary muscles and the loss of flexibility in the crystalline lens. In a healthy eye, these muscles contract to change the shape of the lens, allowing it to focus on nearby objects through a process called accommodation. As people age, typically after 40, the muscles lose their effectiveness and the lens hardens, making it difficult to focus on close-up tasks like reading. This condition is distinct from myopia or hypermetropia and is generally corrected using convex lenses or bifocals to restore near-vision clarity.
Click below to open Discussion & Feedback
0 Issues
Please
login to comment or Report Issues.