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Retinasphalt :: Retinasphalt (n.) Alt. of Retinasphaltu.

Myeloidin :: Myeloidin (n.) A substance, present in the protoplasm of the retinal epithelium cells, and resembling, if not identical with, the substance (myelin) forming the medullary sheaths of nerve fibers..

Xanthophane :: Xanthophane (n.) The yellow pigment present in the inner segments of the retina in animals. See Chromophane.

Eyeglass :: Eyeglass (n.) The retina.

Fuscin :: Fuscin (n.) A brown, nitrogenous pigment contained in the retinal epithelium; a variety of melanin..

Retinoscopy :: Retinoscopy (n.) The study of the retina of the eye by means of the ophthalmoscope.

Rhodophane :: Rhodophane (n.) The red pigment contained in the inner segments of the cones of the retina in animals. See Chromophane.

Chromophane :: Chromophane (n.) A general name for the several coloring matters, red, green, yellow, etc., present in the inner segments in the cones of the retina, held in solution by fats, and slowly decolorized by light; distinct from the photochemical pigments of the rods of the retina..

Phenakistoscope :: Phenakistoscope (n.) A revolving disk on which figures drawn in different relative attitudes are seen successively, so as to produce the appearance of an object in actual 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..

Phosphene :: Phosphene (n.) A luminous impression produced through excitation of the retina by some cause other than the impingement upon it of rays of light, as by pressure upon the eyeball when the lids are closed. Cf. After-image..

Ophthalmoscope :: Ophthalmoscope (n.) An instrument for viewing the interior of the eye, particularly the retina. Light is thrown into the eye by a mirror (usually concave) and the interior is then examined with or without the aid of a lens..

Melanin :: Melanin (n.) A black pigment found in the pigment-bearing cells of the skin (particularly in the skin of the negro), in the epithelial cells of the external layer of the retina (then called fuscin), in the outer layer of the choroid, and elsewhere. It is supposed to be derived from the decomposition of hemoglobin..

Optography :: Optography (n.) 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..

Retinaculum :: Retinaculum (n.) A connecting band; a fraenum; as, the retinacula of the ileocaecal and ileocolic valves..

Vision :: Vision (v.) The faculty of seeing; sight; one of the five senses, by which colors and the physical qualities of external objects are appreciated as a result of the stimulating action of light on the sensitive retina, an expansion of the optic nerve..

Photogene :: Photogene (n.) A more or less continued impression or image on the retina.

Retinaculum :: Retinaculum (n.) One of the retractor muscles of the proboscis of certain worms.

Lipochrin :: Lipochrin (n.) A yellow coloring matter, soluble in ether, contained in the small round fat drops in the retinal epithelium cells. It is best obtained from the eyes of frogs..

Retina :: Retina (n.) The delicate membrane by which the back part of the globe of the eye is lined, and in which the fibers of the optic nerve terminate. See Eye..

Photochemical :: Photochemical (a.) Of or pertaining to chemical action of light, or produced by it; as, the photochemical changes of the visual purple of the retina..

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