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proactive 55 contact lens:
- proactive / praktiv/ adj. (of a person, policy, or action) creating or controlling a situation by causing something to happen rather than responding to it after it has happened: be proactive in identifying and preventing potential problems. DERIVATIVES: proaction / prakshn/ n. proactively adv. proactivity / praktivt/ n.
- inhibition, proactive See proactive interference.
- proactive interference n. Impairment of learning or performance of a task caused by having previously learnt similar information or a similar task. Also called proactive inhibition. See also Ranschburg inhibition, Skaggs-Robinson paradox. Compare retroactive interference. PI abbrev.
proactive 55 contact lens:
proactive 55 contact lens:
- contact process see sulfuric acid . Author not available, CONTACT PROCESS., The Columbia Encyclopedia, Sixth Edition 2007
- contact receptor n. A sensory receptor such as a touch receptor or a taste receptor that is stimulated by an object or substance touching it. Compare distance receptor.
- contact lens n. a thin plastic lens placed directly on the surface of the eye to correct visual defects.
- contact sport n. a sport in which the participants necessarily come into bodily contact with one another.
- contact inhibition The cessation in vitro of both movement and replication in a cell on making contact with other cells, such that a confluent monolayer is formed in the culture. Probably it occurs as a result of the formation of cytoplasmic bridges between cells. In many cancer cells this inhibition is absent.
- eye contact n. The event of two people simultaneously gazing at each other in the vicinity of each other s eyes. Also called mutual gaze. See also equilibrium hypothesis, gaze aversion, non-verbal communication, regulator.
- contact verb contact the head officesynonyms: get/be in touch with, get hold/ahold of, communicate with, be in communication with; write to, write, notify, phone, call, speak to, reach.
- contact hypothesis n. The proposition that sheer social contact between hostile groups is sufficient to reduce intergroup hostility. Empirical evidence suggests that this is so only in certain circumstances.
proactive 55 contact lens:
- telephoto lens Camera lens with a long focal length. A true telephoto lens has a focal length longer than the physical length of the lens, as opposed to a long-focus lens, in which the focal length is equal to the physical length. For a 35mm camera, any lens with a focal length of more than c.80mm may be regarded as a telephoto lens. For larger-format cameras, the focal length may be as much as 1000mm.See also photography
- crystalline lens n. The biconvex, transparent, elastic structure immediately behind the iris of the vertebrate eye that helps to focus light rays on to the retina, although most (about two-thirds) of the refraction of light entering the eye occurs at the cornea. The degree of convexity of the crystalline lens can be altered by radial ciliary muscles up to about age 45, after which the lens becomes hard and its focus cannot be altered. See also aberration (3), accommodation (1), ametropia, aphakia, astigmatism, cataract, cycloplegia, lens, refraction. Compare compound eye, ommatidium.[So called because of its internal crystalline structure]
- lens XVII. L. lens LENTIL; so called on account of its shape.
- Series of concentric rings, each consisting of a thin part of a simple lens, assembled on a flat surface. G.-L.-L. Buffon (1748) first had the idea of dividing a lens surface into concentric rings to reduce the weight. In 1820 his idea was adopted by Augustin-Jean Fresnel (1788 1827) for the construction of lighthouse lenses. Fresnel lenses have the optical properties of much thicker and heavier lenses. They are used in spotlights, floodlights, railroad and traffic signals, and decorative lights. Some thin Fresnel lenses are molded in plastic, the width of the rings being only a few thousandths of an inch; such lenses are used in cameras and small projectors.
- contact lens Lens worn on the cornea to aid defective vision. Invented in 1887, lenses were initially made of glass. Modern contact lenses, developed (1948) by Kevin Tuohy, are made of plastic. Hard (corneal) lenses cover the pupil and part of the cornea. They are usually gas-permeable (allowing oxygen to reach the cornea). Soft (hydrophilic) lenses cover the whole cornea and are hydrated in saline solution.
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