bifocal (redirected from bifocalism)

bifocal /bi·fo·cal/ (bi-fo´-) (bi´fo-k'l)

1. having two foci.

2. containing one part for near vision and another part for distant vision, as in a bifocal lens.

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bi·fo·cal (b-fkl, bf-)

adj.

1. Having two focal lengths.

2. Having one section that corrects for distant vision and another that corrects for near vision.

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bifocal

[bīfō′kəl]

Etymology: L, bis + focus, hearth

1 pertaining to the characteristic of having two foci.

2 (of a lens) having two areas of different focal lengths.