Fig. 46. Dysthyroid optic neuropathy. A. Patient with 4 years of stable ophthalmopathy noted progressive right visual loss to 20/80. B. Right disc is edematous and elevated. Lateral orbital decompression with floor fracture was performed. Within 48 hours, vision was 20/25, and the disc detumesced (C). D. The fundus of a different patient demonstrates a hyperemic, edematous disc and retinochoroidal folds (arrows).