Visual Field Defects Flashcards
Describe left homonymous hemianopia and where the lesion is
The left side of the visual field is not seen in both right and left eyes.
The lesion is in the right optic tract
Describe what you will see in right optic nerve lesion
In a right optic nerve lesion you would get complete blindness in the right eye
Describe what you would see in a right temporal lobe lesion
PITS - parietal inferior, temporal superior
Left sided superior homonymous quadrantinopia
Describe where the lesion is in a right sided inferior quadrantinopia
Left parietal lobe
When would you see an arcuate scotoma?
Moderate glaucoma
What is a scotoma?
Area of defect - blind spot
What do you see in lesion at tip of right occipital lobe?
Left homonymous central scotoma
What is a congruous defect? Incongruous?
Complete of symmetrical visual field loss
Incomplete or asymmetrical
What would you see in optic chiasm lesion?
Bitemporal hemianopia
What do you get in inferior chasmal compression? What causes this?
Upper quadrant defect > Lower quadrant defect
Pituitary tumour
What do you get in superior chasmal compression? What causes this?
Lower quadrant defect > upper quadrant defect
Craniopharyngioma
What do you get in a lesion of the occipital cortex?
Contralateral homonymous hemianopia
With macula spearing due to anastomosis between the posterior and middle cerebral arteries supplying macula.
Pupils react normally
What do you get in optic nerve lesion?
Blindness ipsilaterally
Direct pupil reflex is absent, indirect intact
What do you get in optic chiasm lesion?
Bitemporal hemianopia due to fibres coming from both nasal halves of both retina.
Normal pupillary refelxes
What do you get in optic tract lesion?
Contralateral homonymous hemianopia
Right lesion causes left temporal and right nasal hemianopia
Normal pupillary refelxes
