Labels:text | screenshot | black and white | black | document OCR: ir If a large pituitary or parapituitary tum e visual compresses the optic chiasm, it may cau ansmitted field defects. The nasal visual fields are visual by temporal retinal fibres. The temporal fibres and fields are transmitted by the nasal retina refore, if, these fibres cross at the optic chiasm. Th ur grows as frequently is the case, a pituitary tum e nasal upwards centrally towards the chiasm, t hitially central fibres become compressed, thus fect. If the causing an upper outer quadrant field d Iplete pressure on the chiasm continues, a con bitemporal hemianopia may occur. Wit gress to long-standing compression, this will pr The irreversible optic atrophy and blindness visual field growth of the tumour and the resultant Further defects may, however, be asymmetrical. amic upward extens ...
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