focal point

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an·te·ri·or fo·cal point

the point where parallel rays from the retina are focused.

focal point

Etymology: L, focus, punctus, pricked
a point at which rays of light meet when deflected, either by reflection or refraction.

an·te·ri·or fo·cal point

(an-tēr'ē-ŏr fō'kăl poynt)
The point where parallel rays from the retina are focused.

pos·te·ri·or fo·cal point

(pos-tēr'ē-ŏr fō'kăl poynt)
The point of a compound optic system where parallel rays entering the system are focused.

focal point

The point at which a group of light rays converge.
See also: point
References in periodicals archive ?
Another internal focal point for some women in labor is to focus on their respirations.
When planning a composition, I often mentally divide the picture into three components--the focal point, supportive structures, and background.
When considering a focal point for a garden there is a tendency to think only of plants that rear their heads above their neighbours at the back of beds and borders, of hedges trimmed into interesting shapes, an ornamental tree perhaps, or a particular grouping of flowering plants or shrubs.
Potential hazards may not be as much fun to work with as focal points, but they are a crucial part of the lightscape.
If these patterns hold true for people with other types of epilepsy, says Litt, it should be possible to develop an implanted device that can identify these abnormal electrical signals in plenty of time to abort the seizure by releasing small quantities of a drug or electrically stimulating focal points to ward off synchronized nerve impulses.
Many of these methods for achieving focal points overlap, and often several of them will occur as you organize flowers, foliages, and accessories into a floral composition.
For one thing, focal points help their creators organize turbocharged technology webs [1] comprising many different players, linked by formal or informal alliances, that cooperate to their mutual benefit by agreeing to share a common technology platform.
For example, your focal point could remind you that you had paid your dues in training and were now ready to meet any challenge.
A focal point of each wing is a three-story atrium.
Also, when viewed from the main approach (Parizska) there is an interrupted convex facade between the two focal points - the Old Town Hall and the Church of Our Lady of Tyn - where you would expect to see a concave facade.
A novel reciprocal lens with two pairs of focal points on each side of the lens, providing a total of 180 [degrees] of scanning, is also discussed.