List two causes of presbyopia. Draw labelled diagram of a lens used for the correction of this defect of vision.
Causes of Presbyopia :
(i) Ageing
(ii) beaking of ciliary muscles
It is treated by using a trifocal lens both concave and convex
CBSE Class 10 board exams twice a year ‘relief’ or ‘burden’? Parents, schools share mixed views
CBSE Class 10 exams twice a year from 2026; 64.4% students in favor, second attempt optional
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