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

 

 

 

 
 
 
 
 

Answers (1)

Causes of Presbyopia :

(i) Ageing 

(ii) beaking of ciliary muscles 

It is treated by using a trifocal lens both concave and convex

           

 

Posted by

Sumit Saini

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