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

After-image :: After-image (n.) The impression of a vivid sensation retained by the retina of the eye after the cause has been removed; also extended to impressions left of tones, smells, etc..

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

Optical :: Optical (a.) Of or pertaining to the eye; ocular; as, the optic nerves (the first pair of cranial nerves) which are distributed to the retina. See Illust. of Brain, and Eye..

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

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..

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

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..

Optogram :: Optogram (n.) An image of external objects fixed on the retina by the photochemical action of light on the visual purple. See Optography.

Myopia :: Myopia (n.) Nearsightedness; shortsightedness; a condition of the eye in which the rays from distant object are brought to a focus before they reach the retina, and hence form an indistinct image; while the rays from very near objects are normally converged so as to produce a distinct image. It is corrected by the use of a concave lens..

Image :: Image (n.) The figure or picture of any object formed at the focus of a lens or mirror, by rays of light from the several points of the object symmetrically refracted or reflected to corresponding points in such focus; this may be received on a screen, a photographic plate, or the retina of the eye, and viewed directly by the eye, or with an eyeglass, as in the telescope and microscope; the likeness of an object formed by reflection; as, to see one's image in a mirror..

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..

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

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..

Hypermetropy :: Hypermetropy (n.) A condition of the eye in which, through shortness of the eyeball or fault of the refractive media, the rays of light come to a focus behind the retina; farsightedness; -- called also hyperopia. Cf. Emmetropia..

Irradiation :: Irradiation (n.) The apparent enlargement of a bright object seen upon a dark ground, due to the fact that the portions of the retina around the image are stimulated by the intense light; as when a dark spot on a white ground appears smaller, or a white spot on a dark ground larger, than it really is, esp. when a little out of focus..

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..

Retinasphaltum :: Retinasphaltum (n.) Retinite.

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

Retinaculum :: Retinaculum (n.) One of the annular ligaments which hold the tendons close to the bones at the larger joints, as at the wrist and ankle..

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