Presentation is loading. Please wait.

Presentation is loading. Please wait.

RETINOTOPIC MAP:.

Similar presentations


Presentation on theme: "RETINOTOPIC MAP:."— Presentation transcript:

1 RETINOTOPIC MAP:

2 Perimetric testing to Diagnose field defects
View from above Perimetric testing to Diagnose field defects

3 Each eye’s field of View (visual field) is mapped out
Can light be detected throughout the visual field?

4

5 Perimetric Map shows lower right
quadrant blindness (quadrantanopsia) in both eyes

6 Hemianopia Deficit in 1/2 VF (homonymous: both eyes)

7 Scotoma field defect within a quadrant

8 Quadrantanopsia defect affects 1/4 VF

9 Gordon Holmes (1919) maps the visual field onto primary visual cortex creating an early look at the Retinotopic map.

10 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.

11 Sensitive areas are “magnified”
Field of View Fovea Cortical Map of Visual Field


Download ppt "RETINOTOPIC MAP:."

Similar presentations


Ads by Google