Visual parameters in patients with pituitary adenoma before and after transsphenoidal surgery.

Eighty-two patients with pituitary adenoma who underwent transsphenoidal surgery were examined before and after surgery. Nineteen patients had a normal preoperative neuro-ophthalmological examination. All of these patients maintained normal visual parameters postoperatively. The remaining 63 patients had tumour-related loss of visual acuity, visual field, or both. These patients ranged in age from 18 to 78 years. Duration of symptoms ranged from one day to ten years, with a median of six months. Preoperative visual acuity was 6/12 or better in 72% of eyes, with 90% of patients having 6/12 or better in their better eye. Only 7% of eyes had a normal preoperative visual field. Both visual acuity and visual field improved postoperatively in the majority of eyes. In eyes that were examined within one week after surgery and subsequently, substantial improvement occurred within the first postoperative week, but further improvement continued over weeks to months postoperatively, with visual field taking longer to stabilise than visual acuity. Visual acuity at last examination was 6/12 or better in 87% of eyes, and visual field at last examination was normal in 50% of eyes. A total of 92% of patients had visual acuity of 6/12 or better in their better eye, and 62% of patients had a normal visual field in their better eye. Visual acuity at last examination was correlated with both age and preoperative visual acuity. Last visual field also was correlated with both age and preoperative visual field. Patients with preoperative optic atrophy had a poorer visual prognosis than did patients with normal fundi.