Evaluation of a patient with a pituitary tumor. A, Bilateral ONH pallor. B, The preoperative visual field demonstrates bitemporal hemianopia. C, OCT shows minor nasal thinning on the right, with a normal average RNFL thickness of 99 um. The left shows generalized thinning, with disproportionate thinning nasally and temporally, and an average thickness of 67 um. The thin RNFL on the left (because it is <75 um) suggests a poor recovery, while a normal preoperative RNFL suggests significant recovery of visual field to normal/near-normal levels. D, The postoperative visual field defect shows near-normal resolution of the temporal visual field on the right and persistent temporal defect on the left.