1. (F) The point at which the light rays meet after passing through a convex lens. 2. The center, or the starting point, of a disease process. [L. a hearth]
- conjugate foci two points so related to a lens or concave mirror that an image at one point is focused at the other, and vice versa.
- Ghon f. SYN: Ghon tubercle.
- natural f. of infection an ecosystem in which an infectious agent normally persists in nature; e.g., yellow fever virus in a jungle monkey-Haemagogus mosquito ecosystem.
- principal f. the real or virtual meeting point of rays passing into a lens parallel to its axis.
- real f. the point of meeting of convergent rays.
- virtual f. the point from which divergent rays seem to proceed, or that at which they would meet if prolonged backward.

* * *

fo·cus 'fō-kəs n, pl fo·ci 'fō-.sīalso -.kī also fo·cus·es
1 a) a point at which rays (as of light, heat, or sound) converge or from which they diverge or appear to diverge specif the point where the geometrical lines or their prolongations conforming to the rays diverging from or converging toward another point intersect and give rise to an image after reflection by a mirror or refraction by a lens or optical system
b) a point of convergence of a beam of particles (as electrons)
b) adjustment for distinct vision also the area that may be seen distinctly or resolved into a clear image
3) a localized area of disease or the chief site of a generalized disease or infection
focus vb, fo·cused also fo·cussed; fo·cus·ing also fo·cus·sing vt
1) to bring (as light rays) to a focus
2 a) to adjust the focus of (as the eye or a lens)
b) to bring (as an image) into focus vi
1) to come to a focus
2) to adjust one's eye or a camera to a particular range
fo·cus·able -kəs-ə-bəl adj

* * *

1. n. the point at which rays of light converge after passing through a lens.
2. n. the principal site of an infection or other disease.
3. vb. (in ophthalmology) to accommodate (see also accommodation).

* * *

fo·cus (foґkəs) pl. foґci [L. “fire-place”] 1. the point of convergence of light rays or of the waves of sound. 2. the chief center of a morbid process. 3. cardiac pacemaker.

Medical dictionary. 2011.

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