Sat February 25, 2012 By: Lakshyajeet Gogoi

How is eye lens made according to the required defect of vision? What is its constituents?

Expert Reply
Sun February 26, 2012
The lens is made according to deffect , as for farsightedness we have to use a bioconvex lens , the focal length , we want a bio convex lens by which if an object is placed on the 25 cm , it appears that object is at near point of deffected eye. Means for that lens u=25 cm and v=near point of deffected eyea and now we can calculate the requried focal length.The desired lens can be made by lens maker forumla.
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