optic disc

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Related to optic discs: Optic nerve head

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 ?
This patient had features suggesting an atypical optic neuritis, particularly haemorrhages that accompanied optic disc swelling.
Each participant had baseline optic disc images taken using the HRT at the start of the study and had follow-up images taken annually.
Fundus assessment at the eye examination now revealed a normal optic nerve head appearance in the right eye, with a flat optic disc and well defined margins visible (Figure 1, right).
The large optic disc sizes found in myopia might be explained, in part, by stretching of the eye, and therefore a deformation of the lamina cribrosa.
b) Large sized optic discs with CD ratios of Right 0.
1) Congenital optic nerve anomalies without systemic associations include tilted disc, disc drusen, optic disc pit and myelinated nerve fibres.
In many cases though, it is not immediately clear whether an optic disc is physiologically unusual, or if it is pathologically damaged.
Stage 4 macular holes show enlargement of this round defect, which is then surrounded by a cuff of subretinal fluid with complete posterior vitreous separation from the posterior pole and optic disc.
She had no symptoms but her optometrist referred her due to suspicious appearances of the optic discs in both eyes.
5% of all optic discs, whilst the GDx VCC and HRT devices accurately diagnosed 93.
Conversely, large optic discs may appear to show little change in the NRR distribution in the presence of progressive glaucoma.
Her research showed that large optic discs tend to produce false positives and that small optic discs need extra care as early glaucoma damage could be missed - a useful tip for interpreting HRT data.