Patterns of visual field loss depend on the injury .
The most common are hemianopia , loss of an entire hemisphere of vision ; quadrantanopia , loss of a quadrant of vision ; and scotoma , loss of an irregular section of vision .
Patterns of visual field loss depend on the injury , but the most common are hemianopia , loss of an entire hemisphere of vision ; quadrantanopia , loss of a quadrant of vision ; and scotoma , loss of an irregular section of vision .