optic disc


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Related to optic disc: optic cup, macula, macula lutea

op·tic disc

[TA]
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;

optic disc

the small blind spot on the surface of the retina, located about 3 mm to the nasal side of the macula. It is the point where the fibers of the retina leave the eye and become part of the optic nerve. It is the only part of the retina that is insensitive to light. At its center the porus opticus marks the point of entrance of the central artery of the retina. Also called
Usage notes: (informal)
blind spot, discus nervi optici.
enlarge picture
Optic disc

op·tic disc

(op'tik disk) [TA]
An oval area of the ocular fundus devoid of light receptors where the axons of the retinal ganglion cells converge to form the optic nerve head.
Synonym(s): discus nervi optici [TA] , blind spot (3) , optic papilla.

optic disc

The small circular area at the back of the eye at which all the nerve fibres from the retina come together to form the optic nerve.
References in periodicals archive ?
The optic disc becomes pale to gray brown owing to loss of capillaries on its surface and demyelination and atrophy of nerve fibers caused by extensive degeneration of retina (Maggs, 2013).
Huang JY, Pekmezci M, Mesiwala N, Kao A, Lin S (2011) Diagnostic power of optic disc morphology, peripapillary retinal nerve fiber layer thickness, and macular inner retinal layer thickness in glaucoma diagnosis with fourier-domain optical coherence tomography.
Khan et al27 reported optic disc hyperaemia and optic neuritis secondary to INF therapy.
In this study, the HRT's method of analyzing optic discs was shown to be a powerful and accurate predictor of glaucoma in patients with elevated eye pressure.
If I go to an eye care professional and I have my eyes examined I would want them to look at my optic disc and make their own decision about whether I have glaucoma, but I would also be reassured if they did an OCT because I think it can reveal things that a human can't," Professor Foster emphasised.
Unlike POAG, NAION is characterized by optic disc swelling with resolution over weeks, visual field defects, morphological alteration, pallor of the optic disc, and relatively preserved neuroretinal rim.
Paper Disease Techniques No [1] Optic Disc Five Popular Swarm Intelligence Algorithms: detection Artificial Bee Colony, Particle Swarm Optimization, Bat Algorithm, Cuckoo Search and Firefly Algorithm.
5 mm area over the optic disc using five repeated B-scans at 216 raster positions, with each B-scan consisting of 216 A-scans.
Example of optic disc swelling in anterior ischemic optic neuropathy due to giant cell arteritis (ie, arteritic) (A) and optic disc swelling from nonarteritic anterior ischemic optic neuropathy (B).
Typically, the procedures used for retinal analysis include the identification of ocular physiology elements, like blood vessels, optic disc, and fovea [12-13].
Tapetal area was smaller in Chihuahua and Pug breed of dogs where optic disc was in non tapetum.
These features are obtained if blood vessel and optic disc in the retinal images are eliminated.