1.

What are bifocal lenses ? Who needs to use them ?

Answer»

Solution :Bifocal lenses are eyeglasses made of two distinct lenses-an UPPER convex LENS and a POWER concave lens- attached suitably. It is used by people suffering from a visual defect where they cannot see nearby and distant OBJECTS clearly. The concave lens is used for to aid distant vision while convex lens helps VIEWING nearby objects clearly.


Discussion

No Comment Found