Bitemporal hemianopsia (or Bitemporal hemianopia) is the medical description of a type of partial blindness where vision is missing in the outer half of both the right and left visual field. It is usually associated with lesions of the optic chiasm, the area where the optic nerves from the right and left eyes cross near the pituitary gland.
Bitemporal hemianopia most commonly occurs as a result of tumors located at the mid-optic chiasm. Since the adjacent structure is the pituitary gland, some common tumors causing compression are Pituitary adenomas, and Craniopharyngiomas.
The visual field of each eye can be divided in two vertically, with the outer half being described as temporal, and the inner half being described as nasal.
"Bitemporal hemianopsia" can be broken down as follows:
Rapidly Progressive Visual Loss Caused by a Sellar Arachnoid Cyst: Reversal With Transsphenoidal Microsurgery. (Case Histories).
Nov 01, 2001; ABSTRACT: Rapidly progressive vision loss is an uncommon presentation of a parasellar lesion. This report describes a patient...