图形视诱发电位（P-VEP）
眼科项目
≈ ¥200-400
(≈ $28-57)
大约15-30分钟
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项目介绍
图形视诱发电位（P-VEP）在一般公立医院参考费用约¥140-320，三甲医院参考费用约¥200-400，常用于相关诊断评估与就医安排，费用随医院及地区有所差异。
主要用途
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.
正常值范围
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.
偏低可能原因
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.
偏高可能原因
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.