What is presbyopia? Write two causes of this defect. – InterviewSolution

1.	What is presbyopia? Write two causes of this defect.
Answer» Presbyopia: This defect is caused due to ageing. The person suffering from this disease cannot see nearby as well as far off objects. It is caused due to weakening of ciliary muscles. The lens is not able to change the focal length. It can be corrected by using bi-focal lens.

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