optic disk

Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia.
Related to optic disk: optic cup, fovea


a circular or rounded flat plate; often spelled disc in names of anatomic structures.
articular disk a pad of fibrocartilage or dense fibrous tissue present in some synovial joints.
Bowman's disk one of the flat plates making up a striated muscle fiber.
choked disk papilledema.
ciliary disk pars plana.
embryonic disk (germ disk) (germinal disk) a flattened round bilaminar plate of cells in the blastocyst of a mammal, where the first traces of the embryo are seen; called also embryonic or germinal area.
herniated disk see herniated disk.
intervertebral disk the layer of fibrocartilage between the bodies of adjoining vertebrae; see also herniated disk.
intra-articular d's articular disk.
Merkel's d's small cup-shaped tactile receptors in the skin that are particularly sensitive to continuous pressure.
optic disk the intraocular part of the optic nerve formed by fibers converging from the retina and appearing as a pink to white disk in the retina; there are no sensory receptors in the region and hence no response to stimuli. Called also blind spot.
ruptured disk herniated disk.
slipped disk popular term for herniated disk.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

optic disk

n. Anatomy
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

Optic disk

The small area in the retina where the optic nerve enters the eye that is not sensitive to light. Also called the blind spot.
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.


Edmé, French physicist, 1620-1684.
Mariotte blind spot - an oval area of the ocular fundus devoid of light receptors where the axons of the retinal ganglion cell converge to form the optic nerve head. Synonym(s): optic disk
Mariotte bottle - a stoppered bottle with bottom outlet, used as a reservoir for constant infusions.
Mariotte experiment - an experiment that proves the absence of photoreceptors where the optic nerve enters the eye.
Mariotte law - Synonym(s): Boyle law
Medical Eponyms © Farlex 2012
References in periodicals archive ?
Butt, "Retinal Images: Optic Disk Localizationand Detection," in Proceedings of the International Conference Image Analysis and Recognition (ICIAR '10), vol.
Chutatape, "Automatic location of optic disk in retinal images," in Proceedings of the 2001 International Conference on Image Processing, pp.
Another physiological characteristic is that all vessels and sanguine branches originate in the optic disk. It is known that these branches follow parabolic trajectories that converge to the OD.
Marinho, "Segmentation of the optic disk in color eye fundus images using an adaptive morphological approach", Comput Biol Med, vol.
Heidelberg Retina Tomograph (HRT) has been extensively used to study the optic disk characteristics.
Morphology and templates are evaluated to remove the optic disk and blood vessels.
You can locate the optic disk by noting where the blood vessels originate or the blue arcs terminate in Activities 6 and 10, respectively If you keep one eye closed and blink with the other eye while looking at a uniformly illuminated surface (such as the inner surface of a ping pong ball cut in half to fit over the eye), you may see a gray disk at the location of the optic disk (Palmer, 1991).
In the subtract image, result is determined by blood vessel, optic disk, background, and drusen.
(c) Fundus pictures (right eye on the left and left eye on the right) of patient number 8 showing swelling of the retinal nerve fibers involving the superior and inferior arcades around the optic disk, as well as retinal vessel tortuosity.
Comparison of optic disk and retinal nerve fiber layer thickness in non glaucomatous and glaucomatous patients with high myopia.
Optic disc pit (ODP) is a rare congenital optic disk abnormality with an incidence of 1/11,000.