focus, foci +

Having the ability to focus automatically; such as, an autofocus lens or an autofocus camera.

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. Embodying two distinct and often conflicting goals, interests, or courses of action.

Bibocals are eyeglasses made with double lenses of different focuses so that the wearer may have one focus for distant vision and one of close focus for reading.

A lens used in cases of presbyopia, in which one portion is suited for distant vision, the other for reading and close work in general.

The reading addition may be cemented to the lens, fused to the front surface, or ground into a one-piece form; other bifocal lenses are the flat-top Franklin type, or blended invisible.

Eye glasses with lenses that are divided into two parts.

The upper half is for looking at things far away and the lower half is for reading or for looking at things that are near.

Located or occurring at the point on the earth's surface directly above the focus epicenter of an earthquake or underground nuclear explosion.

1. Plural of focus.
2. The origin or center of a disseminated disease.

A device for measuring the dioptic strength of a lens.

1. A point at which rays of light or other radiation converge or from which they appear to diverge, as after refraction or reflection in an optical system.
2. The distinctness or clarity of an image rendered by an optical system.
3. The state of maximum distinctness or clarity of an image; such as, in focus, out of focus.
4. An apparatus used to adjust the focal length of an optical system in order to make an image distinct or clear; for an example, a camera with automatic focus.
5. A center of interest or activity.
6. Close or narrow attention; concentration.
7. A condition in which something can be clearly apprehended or perceived: "He simply couldn't get the problem into focus."
8. In pathology, the region of a localized bodily infection or disease.
9. In geology, the point of origin of an earthquake.

1. The concentration of attention or energy on something.
2. The act of bringing into focus or converging at a point.
3. The change in strength of the crystalline lens of the eye that permits clear vision to be achieved at various distances.

A device that focuses solar radiation on a surface or point.

1. Pertaining to, or designating a family unit or structure headed by the mother and lacking a father permanently or for extended periods.
2. Focused or centered on the mother.

1. Having several foci.
2. With reference to an eyeglass lens having several focusing areas that correct for both nearsightedness and farsightedness.

1. A lens for near and distant vision in which the reading portion is a continuously variable curve.
2. A lens whose power increases continuously and regularly in a downward direction, avoiding the discontinuity of bifocal and trifocal lenses.

For the altar, For the hearth.

Also "For the altar (church or religion), For the hearth (home).

1. To change or to adjust the focus of something; such as, a camera or a telescope.
2. To concentrate attention or efforts on something different.