optic nerves

Also found in: Dictionary, Thesaurus, Encyclopedia.

Related to optic nerves: Cranial nerves, Olfactory nerves

optic nerves

The 2nd of the 12 pairs of CRANIAL NERVES which emerge directly from the brain. The optic nerves are bundles of about one million nerve fibres originating in the RETINAS and connecting these to the brain. Each nerve passes through a channel in the bone at the back of the eye sockets (orbits) to reach the inside of the skull and to join with, and partially cross over, its fellow in the OPTIC CHIASMA.

References in periodicals archive ?

Ischemic optic neuropathy (ION) refers to infarction of any portion of the optic nerve from the chiasm to optic nerve head.

Pathology of Ischemic Optic Neuropathy

94 Total 101 100 Table 3: Type I Optic Nerves Involvement No.

Computed tomographic evaluation of optic nerve patterns in Indian population

Additionally, bony dehiscence of the sinus overlying the optic nerve has been found in 4% of cadavers.

Sphenoid sinus dehiscence as a risk for visual consequences in an immunocompromised patient

October 22, 2013 -- A study performed here found no evidence that stem cell therapy improves vision for children with optic nerve hypoplasia (ONH).

Stem cell therapy for pediatric optic nerve hypoplasia proven useless

The diagnosis of ODD was made on the basis of clinical appearance of the optic nerves, which showed autofluorescence, the advanced visual field defects, and the normal MRI.

Optic disc drusen presenting with binasal hemianopia/binazal hemianopsi prezentasyonlu optik disk druzeni

The spinal taps showed either top normal or slightly elevated pressures in the spinal fluid surrounding the brain and optic nerves.

Long space missions severely deteriorate astronauts' vision

Justyna said: "Only stem cells can help her optic nerves grow and give her sight.

BLINDTOT'S CHINA TRIP FOR SIGHT OP; Town's kindness gives Amelia new hope

Dedicated imaging of the orbits with and without contrast administration (using fat-suppression techniques) revealed faint areas of increased signal on short tau inversion recovery (STIR) sequences and intense, patchy enhancement of both the optic nerves following contrast administration (Figures 1 and 2).

Ischemic optic neuropathy

T2 weighted MRI scanning showed localised intrinsic high signal in both optic nerves posteriorly and partial resolution of frontal and subdural haemorrhages (Figure 2).

Hypotension and anaemia--a blinding combination

Over time, some recurring visual problems may no longer resolve, especially if the optic nerves become damaged.

Managing vision problems

While experimenting on optic nerves in rats, Larry Benowitz of Children's Hospital in Boston and his colleagues discovered by accident that scratching or poking the lens in an animal's eye could prompt damaged neurons to regrow axons farther toward the brain than researchers had ever seen.

Eye for growth: new protein prompts optic nerve regrowth

If you look at the optic nerves in 100 different people, they will all look very different.

Don't be blind-sighted by glaucoma: with early detection and treatment, you can often protect your eyes against the profound and permanent vision loss from glaucoma