a) Which defect of vision is represented in this case?
(b) What could be the two causes of this defect?

Dear student,
(a) Nearsightedness (myopia) is a common vision condition in which you can see objects near to you clearly, but objects farther away are blurry. It occurs when the shape of your eye causes light rays to bend (refract) incorrectly, focusing images in front of your retina instead of on your retina.
(b) The eye lens becomes too convex or curved.
   Depth of the eyeball is too much i.e. eyeball lengthened from front to back. When the length of the eyeball is too long as compared to      the focusing power of the lens of the eye and cornea.


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