visual field defect
An area of reduced or absent vision within the visual field, often indicating neurological pathology along the visual pathway.
Full Definition
A visual field defect represents a region of diminished or absent vision within a patient's field of view. In neuro-ophthalmology, these defects provide crucial localizing information about lesions along the visual pathway, from the retina to the visual cortex. Common patterns include scotomas, hemianopias, and quadrantanopias, each suggesting specific anatomical involvement. Visual field testing using automated perimetry is essential for detecting, characterizing, and monitoring these defects. The pattern and location of defects help distinguish between retinal, optic nerve, chiasmal, and retrochiasmal pathology.
Usage
Usage note: Always describe the pattern, density, and location of visual field defects in clinical documentation.
In Context
- "Automated perimetry revealed a dense left homonymous hemianopia consistent with right occipital infarction." — Neuro-ophthalmology consultation
- "The visual field defect progressed despite treatment, indicating continued optic nerve dysfunction." — Follow-up examination report