Unusual Presentation of Presumed Arteritic Ischemic Optic Neuropathy in Waxy Pale Disc of Retinitis Pigmentosa.

This case report describes an unusual presentation of arteritic anterior ischemic optic neuropathy (AAION) in a 68-year-old patient with retinitis pigmentosa (RP) secondary to Usher syndrome. The authors report a patient with RP who presented with rapid unilateral vision loss. A diagnosis of AAION was made by fluorescein angiography and temporal artery biopsy despite the lack of typical optic nerve features of anterior ischemic neuropathy, which were likely masked due to the waxy pale disc associated with RP. [Ophthalmic Surg Lasers Imaging Retina. 2021;52:350-352.].