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

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..

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..

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..

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

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..

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..

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

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..

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

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

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..

Retinaculum :: Retinaculum (n.) A small gland or process to which bodies are attached; as, the glandular retinacula to which the pollinia of orchids are attached, or the hooks which support the seeds in many acanthaceous plants..

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..

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

Chlorophane :: Chlorophane (n.) The yellowish green pigment in the inner segment of the cones of the retina. See Chromophane.

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

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..

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