Bifocal Lenses
With a segment in the lower area of the lens, a bifocal lens displays two different dioptric powers, which provide the patients with clear near and distant vision.
Parameters
Regardless of the reason you need a prescription for near vision correction, bifocals all work in the same way. A small portion in the lower part of the lens contains the power required to correct your near vision. The rest of the lens usually is for your distance vision. The lens segment devoted to near vision correction can be one of the several shapes.
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