bi·fo·cal 
(bī-fōkəl, bīfō′-)
(bī-fōkəl, bīfō′-)adj.
1. Having two focal lengths.
2. Having one section that corrects for distant vision and another that corrects for near vision, as an eyeglass lens.
3. Having two distinct goals or objects of attention: a bifocal approach to the problem.
pl.n. bi·fo·cals (bīfō′kəlz, bī-fō-)
Eyeglasses with bifocal lenses.
bi·focal·ism n.