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List Two Causes of Presbyopia. Draw Labelled Diagram of a Lens Used for the Correction of this Defect of Vision. - Science

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प्रश्न

List two causes of presbyopia. Draw labelled diagram of a lens used for the correction of this defect of vision. 

थोडक्यात उत्तर

उत्तर

Causes of presbyopia : 

Aging

Weakening of ciliary muscles 

It is treated by using a bifocal lens both concave and convex.

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2018-2019 (March) 31/3/3

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