purpose : to report a rare case of large vascularized astrocytoma on optic disc. case report : a 12-year-old boy with history of decreased vision in the left eye since 5-6 months ago was referred to the ocular oncology service at rassoul akram hospital with provisional diagnosis of retinoblastoma. on examination, visual acuity was counting fingers at 50 cm, and a 3+ relative afferent pupillary ...

purpose: to present a case of herpes zoster ophthalmicus (hzo) with consequent posterior ischemic optic neuropathy (pion). case report: a 58-year-old woman with a history of hzo in her right eye which was under treatment presented with loss of vision to no light perception. on examination, positive relative afferent pupillary defect was detected; however the optic disc was normal on ophthalmosc...

The relative afferent asymmetry between two eyes can be diagnosed using swinging flashlight test, also known as the alternating light test. This remains one of most used clinical tests to this day. Despite test’s straightforward approach, a number factors add variability into methodology and reduce measurement’s validity reliability. includes small poorly responsive pupils, dark iris, anisocori...

Demyelination is assumed to be the cause of the majority of cases of isolated optic neuritis. Because of the importance of establishing the presence of optic nerve dysfunction in patients suspected of having multiple sclerosis several new indices of optic nerve conduction have been reported including the visual evoked potential, the edge-light pupil cycle time, and the Pulfrich test. These meas...

This article describes a case of untreated optic neuritis occurring in the setting coronavirus disease 2019 (COVID-19) infection and provides new insights into natural history this condition. A 29-year-old male patient with no known ocular or systemic presented pain on extraocular movements sudden loss vision inferior visual field affecting right eye. He had tested positive for COVID-19 six day...

• The optic tract syndrome is characterized by a contralateral, incongruous homonymous hemianopia, contralateral relative afferent pupillary defect (RAPD), and optic atrophy due to retrograde axonal degeneration. • Optic disc pallor often results in a pattern of bowtie atrophy of the eye with temporal field loss and atrophy of the upper and lower poles of the disc of the eye with nasal field lo...