Neuro Ophthalmology Glossary
100 terms total — 24 showing — Last updated 15 Sep 2026
hemianopsia
Loss of vision in half of the visual field of one or both eyes.
mydriasis
Abnormal dilation of the pupil that may be pharmacological, neurological, or pathological in origin.
NAION
Non-arteritic anterior ischemic optic neuropathy; sudden vision loss due to ischemia of the optic nerve head.
neuro-ophthalmic examination
Comprehensive assessment combining neurological and ophthalmological techniques to evaluate visual and ocular motor dysf...
nystagmus
Involuntary rhythmic oscillation of the eyes that can indicate neurological or vestibular pathology.
OCT
Optical coherence tomography, a non-invasive imaging technique that provides cross-sectional views of retinal and optic...
ocular flutter
Spontaneous horizontal saccadic oscillations without intersaccadic intervals.
ocular tilt reaction
Triad of head tilt, skew deviation, and ocular torsion resulting from otolith pathway dysfunction in the brainstem.
one-and-a-half syndrome
Horizontal gaze palsy with ipsilateral internuclear ophthalmoplegia from pontine lesion.
opsoclonus
Chaotic, multidirectional saccadic eye movements often associated with myoclonus.
optic atrophy
Degeneration or loss of optic nerve fibers resulting in pallor of the optic disc.
optic coherence tomography angiography
Non-invasive imaging technique using OCT technology to visualize retinal and optic nerve head vasculature without contra...
optic disc drusen
Calcified deposits within the optic nerve head that can mimic papilledema and cause visual field defects.
optic neuritis
Inflammation of the optic nerve typically causing acute vision loss, eye pain, and often associated with multiple sclero...
optical coherence tomography
High-resolution cross-sectional imaging technique that uses light waves to visualize retinal and optic nerve structure.
optokinetic nystagmus
Involuntary eye movements elicited by moving visual stimuli, used to assess visual function.
optokinetic reflex
An involuntary eye movement response to large-field moving visual stimuli, consisting of slow pursuit followed by fast r...
oscillopsia
Visual symptom of apparent movement or oscillation of the environment, often associated with vestibular or eye movement...
palinopsia
Visual phenomenon where images persist or recur after the stimulus has been removed, indicating cortical visual processi...
papilledema
Bilateral optic disc swelling caused by increased intracranial pressure.
Parinaud syndrome
Dorsal midbrain syndrome causing vertical gaze paralysis and pupillary abnormalities.
PERG
Pattern electroretinogram, a specialized test measuring retinal ganglion cell function important in optic nerve disease...
perimetry
The systematic measurement and mapping of visual field sensitivity using standardized test procedures and equipment.
phoria
A latent eye misalignment that is normally controlled by binocular fusion but becomes apparent when fusion is disrupted.
photoreceptor
Specialized retinal cells (rods and cones) that detect light and initiate the visual transduction process.