Bifocal

(bi-f/-kal). With a double focus. Applied to a system of lenses or spectacle gla es with two foci, chiefly used for the correction of presbyopia, when there is at the same time an error of refraction for distant vision. The distance lens is above that for near work. These are sometimes Bijugular (bi-Ju' '-gu-lar). Relating to the two jugular points. Bikh (bii). The Nepalese poison, bish; it is derived from the roots of Aconitum ferox. See Aconite . Bilabe (pi' -lab, or. A surgical instrument for removing foreign bodies from the bladder through the urethra. Bilateral (bi-lat'-er-al). Relating to two sides; sinistrodextral. B. Symmetry, the symmetry of right and left halves. B. Operation. See Lithotomy . Bilateralism (bi-laf -er-al-izm). Bilateral symmetry. w B. Distance Lens.