Tsai R K, Chen J Y, Wang H Z
Department of Ophthalmology, Kaohsiung Medical College, Taiwan, Republic of China.
Kaohsiung J Med Sci. 1997 May;13(5):324-7.
Gaze-evoked amaurosis is an uncommon but pathognomonic symptom of intrinsic orbital mass lesion. The symptom is easily neglected even by ophthalmologists. A 49-year-old woman had a two-year history of dimming vision in her right eye when she looked upward for a few seconds. On examination, her visual acuity was normal and without apparent proptosis. The orbital CT scan and MR imaging showed an intraconal cavernous hemangioma just adjacent to the optic nerve in the right orbit. The pattern visual-evoked potential (PVEP) on primary position was normal in both eyes, but a latency delayed (P100) in the right eye was found after she looked upward for a few seconds. We discuss this interesting finding and review the possible mechanisms involved.
注视诱发的黑矇是眶内原发性肿块病变一种罕见但具有诊断意义的症状。即使是眼科医生也容易忽视这一症状。一名49岁女性有两年病史，即向上看几秒后右眼视力模糊。检查时，她的视力正常，无明显眼球突出。眼眶CT扫描和磁共振成像显示右眼眶内有一个紧邻视神经的锥内海绵状血管瘤。双眼在第一眼位时的图形视觉诱发电位（PVEP）正常，但向上看几秒后发现右眼潜伏期延迟（P100）。我们讨论这一有趣的发现并回顾其中可能涉及的机制。
