Field defect seen in pituitary adenoma is -
Bitemporal hemianopia
Binasal hemianopia
Quadrantanopia
"Pie in sky" defect
The characteristic visual field defect in pituitary adenoma is bitemporal hemianopia due to central optic chiasma lesion. However in early stages qudrantanopia (superior: - Pie in sky or inferior: Pie on the floor) may also occur, but these are not characteristics.