Pituitary adenomas arise in the sellar region, directly adjacent to the optic nerves and optic chiasm superiorly. As the tumor gradually expands, it compresses the visual pathway. Patients first develop visual field defects, namely peripheral vision loss on both sides, followed by rapid deterioration of eyesight, and complete blindness may occur in severe cases.

One patient was escorted into the clinic by family members, complaining of progressively worsening vision over the past two weeks, loss of peripheral vision bilaterally, and frequent collisions with door frames while walking. He visited a local ophthalmology department for several days without identifying the root cause, yet his vision kept declining. A cranial MRI revealed a sellar mass consistent with pituitary adenoma that had compressed the optic chiasm.

Pituitary adenomas arise in the sellar region, directly adjacent to the optic nerves and optic chiasm superiorly. As the tumor gradually expands, it compresses the visual pathway. Patients first develop visual field defects, namely peripheral vision loss on both sides, followed by rapid deterioration of eyesight, and complete blindness may occur in severe cases. Most patients and their families initially seek ophthalmic care. By the time ophthalmic examinations rule out ocular disorders and patients are referred to neurosurgery, their vision has already suffered substantial damage. This patient presented with severely constricted visual fields upon consultation.

For patients with pituitary adenomas complicated by severe visual impairment, time determines visual prognosis. The shorter the duration of optic nerve compression, the higher the likelihood of postoperative visual recovery. Prolonged compression leads to ischemic atrophy of the optic nerves; even after tumor resection, vision cannot be restored. Therefore, prompt surgery is mandatory in such scenarios. Minimally invasive transsphenoidal surgery removes the tumor via the nasal cavity to relieve compression on the optic nerves.

Emergency transsphenoidal resection was scheduled for the patient. On the second postoperative day, the patient reported brighter vision. Follow-up visual field examinations confirmed objective improvements compared with preoperative assessments. Though full restoration of baseline vision cannot be guaranteed, the outcome was favorable relative to the risk of permanent blindness with delayed treatment.

Vision loss is not always attributable to ocular pathologies. If vision cannot be corrected with glasses and ophthalmic workups fail to detect abnormalities — especially when bilateral peripheral visual field defects emerge — cranial MRI is essential to rule out pituitary adenoma. Early detection preserves the chance of visual recovery, whereas diagnosis delayed until total blindness is irreversible.