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Pattern-reversal visual evoked potential

Eye Care estimated about CNY 400-800

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Description

A neurophysiological test measuring electrical responses in the visual cortex to pattern-reversal stimuli, used to assess optic nerve and visual pathway integrity.

Main Uses

Diagnosis and monitoring of optic nerve and visual pathway disorders (e.g., multiple sclerosis, optic neuritis, compressive lesions); objective assessment of visual function in nonverbal patients (infants, intellectually disabled, malingering); pre- and post-surgical evaluation of optic chiasm or occipital lobe interventions; differentiation between retinal vs. post-retinal visual deficits.

Normal Range

Latency (P100 wave): 95–115 ms in adults; Amplitude: 5–20 µV. Latency increases slightly with age and decreases with higher stimulus contrast or larger check size. Interocular latency difference should be <10 ms; interocular amplitude ratio should be >0.7.

Low Values - Possible Causes

Optic nerve demyelination (e.g., multiple sclerosis), optic atrophy (e.g., glaucoma, ischemic optic neuropathy), severe amblyopia, advanced retinal disease (e.g., retinitis pigmentosa), congenital optic pathway malformation.

High Values - Possible Causes

Rare; may include technical artifacts (e.g., excessive electrode impedance, poor signal averaging), hyperexcitable visual cortex (e.g., in some epileptic encephalopathies), paradoxical amplitude elevation due to compensatory cortical reorganization (e.g., post-stroke recovery), or misinterpreted 'high' values resulting from abnormal waveform morphology rather than true physiological increase.

pattern visual evoked potential neuro-ophthalmology test visual pathway assessment

estimated about CNY 400-800