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Of or pertaining to sight; used in sight; serving as the instrument of seeing; as, the visual nerve. The air, Nowhere so clear, sharpened his visual ray. Milton.

To make visual, or visible; to see in fancy. [Written also visualise.] No one who has not seen them [glaciers] can possibly visualize them. Lubbock.

One who visualizes or is proficient in visualization; esp. (Physiol.),

ain achromatic lenses, having the same focus for the actinic and for the brightest of the visual rays.

.] For outness is but the feeling of otherness (alterity) rendered intuitive, or alterity visually represented. Coleridge.

of great circles, which mutually cut one another on the surface of a globe or sphere. -- Visual angle, the angle formed by two rays of light, or two straight lines drawn from the extreme points of an object to the center of the eye. -- For Angles of commutation, draught, incidence, reflection, refraction, position, r…

One whose thoughts take the form of mental sounds or of internal discourse rather than of visual or motor images.

ll crystals, not of the isometric system, are either uniaxial or biaxial. -- Optic axis, Visual axis (Opt.), the straight line passing through the center of the pupil, and perpendicular to the surface of the eye. -- Radical axis of two circles (Geom.), the straight line perpendicular to the line joining their centers…

ant but the quickness or slowness of the return. Bacon. Changes . . . concurrent with the visual changes in the eye. Tyndall.

ly regarded as beneficial in disorders of the eyes. Then purged with euphrasy and rue The visual nerve, for he had much to see. Milton.

Having one's mental imagery prevailingly of the visual type; having one's thoughts and memories mainly in the form of visual images. -- Eye"-mind`ed*ness, n.

A simple visual organ found in many invertebrates, consisting of pigment cells covering a sensory nerve termination.

g, causing opacity; hence, any thin, slight covering. He from thick films shall purge the visual ray. Pope.

image of external objects fixed on the retina by the photochemical action of light on the visual purple. See Optography.

The production of an optogram on the retina by the photochemical action of light on the visual purple; the fixation of an image in the eye. The object so photographed shows white on a purple or red background. See Visual purple, under Visual.

An instrument for showing visually the changes in a varying current; an oscillograph.

l motion, as an animal leaping, etc., in consequence of the persistence of the successive visual impressions of the retina. It is often arranged so that the figures may be projected upon a screen.

ning to chemical action of light, or produced by it; as, the photochemical changes of the visual purple of the retina.

a purple color; as, the purpurogenous membrane, or choroidal epithelium, of the eye. See Visual purple, under Visual.

Of or pertaining to the retina. Retinal purple (Physiol. Chem.), the visual purple.