cone of light

cone

[kōn] 1. a solid figure or body having a circular base and tapering to a point.2. one of the conelike structures which, with the rods" >rods, form the light-sensitive elements of the retina; the cones make possible the perception of color. See also eye" >eye and vision" >vision. Called also retinal cone.3. in radiology, a conical or open-ended cylindrical structure formerly used as an aid in centering the radiation beam and as a guide to source-to-film distance. Cones were commonly attached to the x-ray tube prior to the use of the collimator.4. in therapy" >root canal therapy, a solid substance with a tapered form, usually made of gutta-percha or silver, fashioned to conform to the shape of a root canal.ether cone a cone-shaped device used over the face in administration of ether for anesthesia.gutta-percha cone in therapy" >root canal therapy, a plastic radiopaque cone made from gutta-percha and other ingredients, available in standard sizes according to the dimensions of root canal reamers and files; used to fill and seal the canal along with sealer cements. Called also gutta-percha point.cone of light the triangular reflection of light seen on the tympanic membrane.pressure cone the area of compression exerted by a mass in the brain, as in transtentorial herniation.retinal cone cone (def. 2).silver cone silver point.

light re·flex

1. Synonym(s): pupillary reflex2. a red glow reflected from the fundus of the eye when a light is cast on the retina, as in retinoscopy; Synonym(s): eye reflex, fundus reflex3. a triangular area at the anterior inferior part of the tympanic membrane, extending from the umbo to the periphery, where there is seen a reflection of light. Synonym(s): cone of light, Politzer luminous cone, pyramid of light, red reflex, Wilde triangle

red re·flex

(red rē'fleks) Term describing reflection of light from retina in healthy eyes; abnormality in ocular media, refractive state, or retina can cause this reflex to be abnormal.
Synonym(s): cone of light, light reflex (3) , pyramid of light.

单词	cone of light
释义	DictionarySeelight reflexEncyclopediaSeecone cone of light cone [kōn] 1. a solid figure or body having a circular base and tapering to a point.2. one of the conelike structures which, with the rods" >rods, form the light-sensitive elements of the retina; the cones make possible the perception of color. See also eye" >eye and vision" >vision. Called also retinal cone.3. in radiology, a conical or open-ended cylindrical structure formerly used as an aid in centering the radiation beam and as a guide to source-to-film distance. Cones were commonly attached to the x-ray tube prior to the use of the collimator.4. in therapy" >root canal therapy, a solid substance with a tapered form, usually made of gutta-percha or silver, fashioned to conform to the shape of a root canal.ether cone a cone-shaped device used over the face in administration of ether for anesthesia.gutta-percha cone in therapy" >root canal therapy, a plastic radiopaque cone made from gutta-percha and other ingredients, available in standard sizes according to the dimensions of root canal reamers and files; used to fill and seal the canal along with sealer cements. Called also gutta-percha point.cone of light the triangular reflection of light seen on the tympanic membrane.pressure cone the area of compression exerted by a mass in the brain, as in transtentorial herniation.retinal cone cone (def. 2).silver cone silver point. light re·flex 1. Synonym(s): pupillary reflex2. a red glow reflected from the fundus of the eye when a light is cast on the retina, as in retinoscopy; Synonym(s): eye reflex, fundus reflex3. a triangular area at the anterior inferior part of the tympanic membrane, extending from the umbo to the periphery, where there is seen a reflection of light. Synonym(s): cone of light, Politzer luminous cone, pyramid of light, red reflex, Wilde triangle red re·flex (red rē'fleks) Term describing reflection of light from retina in healthy eyes; abnormality in ocular media, refractive state, or retina can cause this reflex to be abnormal. Synonym(s): cone of light, light reflex (3) , pyramid of light.
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