ABSTRACT
The human pattern reversal retinal potential(PRRP) is a bioelectrical response that reflects neural activity generated in the proximal retina. Visual diseases which affect the retinal ganglion cells and the optic nerve often produce signifjcant reductions in the amplitude of the PRRP. PRRP amplitude reductions are freguently obseved in the patients with primary open angle glaucoma. This study was designed to determine whether patients with ocular hypertension whieh are at risk of developing glaucoma also exhibit PRRP amplitude reductions. 1. As compared to the control group the glaucoma patients showed decreased P1-N2 amplitude and a significant delay of Visual evoked potential(VEP) latency. The retinocortical time was delayed(72%) and PRRP P1-N2 amplitude was decreased in 30 percents of the ocular hypertensive patients. 2. In the glaucoma and ocular hypertension, VEP P1 latency has more diagnoic value than PRRP P1 latency. 3. VEP and PRRP show more diagnostic values and these tests are essential for early diagnosis in the glaucoma.
Subject(s)
Humans , Early Diagnosis , Evoked Potentials, Visual , Glaucoma , Glaucoma, Open-Angle , Ocular Hypertension , Optic Nerve , Retina , Retinal Ganglion Cells , RetinaldehydeABSTRACT
Cavernous hemangiona is the most common primary orbital tumor. The authors experienced two cases of orbital cavernous hemangioma recently. In the first case, a 8-year old Korean girl visited our department in Apr. 11,1978 with right exophthalmos which had showed progressive enlargement in 2 years. The computed tomographic examination of the orbit revealed irregular, partly lobulated mass density with an attenuation value approximating soft tissue in the medial portion of right retrobulbar region. In the second case, a 6-year old Korean girl visited our department in Apr. 16, 1979 with left exophthalmos showed in 3 weeks after trauma. The computed tomographic examination of the orbit revealed well defined mixed soft mass density in the left rerobulbar space. The mass were excised by Killian's approach and histopathologic examination revealed cavernous hemangioma.
Subject(s)
Child , Female , Humans , Exophthalmos , Hemangioma, Cavernous , OrbitABSTRACT
The authors were experienced a case of metastatic adenocarcinoma of the left orbit originating from the lung in a 66 years old Korean male. Most outstanding of his complaint were protrusion of left eyeball, visual disturbance and severe ocular pain of left eye. The tumor was removed because of severe left ocular pain and then, he received with Co. 60 irradiation as much as 4,000 rad. Since then, exophthalmos was slightly reduced but left ocular pain was persisted.