Question

define presbyopia and it's causes

Answer 1

hala mate,

Presbyopia is caused by a hardening of the lens of your eye, which occurs with aging. As your lens becomes less flexible, it can no longer change shape to focus on close-up images. As a result, these images appear out of focus.

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Answer 2

presbyopia is the common defect of vision which generally occurs at Old age. A person suffering from this defect can't see nearby as well as far off object clearly...
presbyopia is caused by.. :---

1) weakening of the ciliary muscles.

2)reduction in the flexibility of the eye lense