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| 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. | |