This study evaluates the structural parameters, by spectral domain optical coherence tomography (OCT), retinal vessel density, using OCT angiography, and visual acuity in patients that received endoscopic endonasal approach for the removal of an intra-suprasellar pituitary adenoma compressing the optic nerve.

The primary outcome was to detect the changes in visual acuity, retinal structural and vascular features at 48 hours and 1 year after Endoscopic Endonasal Approach for the removal of an intra-suprasellar pituitary adenoma compressing the optic nerve.

The secondary outcome was to identify potential biomarker that could predict the functional recovery at 1 year follow up.

Inclusion Criteria:

• age older than 40 years
• diagnosis of pituitary adenoma
• treatment-naïve with Endoscopic Endonasal Pituitary Surgery
• absence of other neurological diseases
• absence of vitreoretinal and vascular retinal diseases

Exclusion Criteria:

• age younger than 40 years
• No diagnosis of pituitary adenoma
• previous treatments with Endoscopic Endonasal Pituitary Surgery
• presence of neurological diseases
• presence of vitreoretinal and vascular retinal diseases

The participans were older than 4 years with pituitary adenoma. They did not present other ophthalmological and neurological diseases.