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RETINOTOPIC MAP:
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Perimetric testing to Diagnose field defects
View from above Perimetric testing to Diagnose field defects
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Each eye’s field of View (visual field) is mapped out
Can light be detected throughout the visual field?
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Perimetric Map shows lower right
quadrant blindness (quadrantanopsia) in both eyes
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Hemianopia Deficit in 1/2 VF (homonymous: both eyes)
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Scotoma field defect within a quadrant
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Quadrantanopsia defect affects 1/4 VF
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Gordon Holmes (1919) maps the visual field onto primary visual cortex creating an early look at the Retinotopic map.
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Gordon Holmes (1919) - original retinotopic map:
Correlated Visual Field Defects with lesion locus Features of Map: Crossed organization Left 17 --> RVF Right 17 --> LVF Fovea: Disproportional representation cortical magnification Inverted organization Lower calcarine --> Upper VF Upper calcarine --> Lower VF NOTE: Each visual cortex represents a visual field NOT an eye.
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Sensitive areas are “magnified”
Field of View Fovea Cortical Map of Visual Field
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