bifocal /bi·fo·cal/ (bi-fo´-) (bi´fo-k'l)
bifocal
1. having two foci.
2. containing one part for near vision and another part for distant vision, as in a bifocal lens.
bi·fo·cal (b -f  k l, bf -)adj. 1. Having two focal lengths. 2. Having one section that corrects for distant vision and another that corrects for near vision. |
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.
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