Visual Field Problems

Question 1

Monocular Vision Loss

Answer 1

Optic Nerve

• Retinal disorders, optic nerve disorders, corneal disorders, trauma

Question 2

Bitemporal Hemianopia

Answer 2

Optic Chiasm

• Loss of outer visual fields in both eyes
• Pituitary tumours, craniopharyngiomas (most often in children), meningioma

Question 3

Contralateral Homonymous Hemianopia

Answer 3

Optic radiation

• Loss of half the visual field in both eyes on the same side
• Macula not spared
• Stroke or tumour affecting optic radiation, occipital lobe lesions

Question 4

Quadrantanopias

Answer 4

Optic Radiation

• Loss of a quarter of the visual field
• Stroke affecting specific pathways in the optic radiation, trauma, craniopharyngioma

NOTE:

• A lesion in the temporal lobe would cause contralateral homonymous superior (upper) quadrantanopia
• A lesion in the parietal lobe would cause contralateral homonymous inferior (lower) quadrantanopia

Question 5

Macular Sparing in Occipital Lobe Lesions

Answer 5

Occipital Lobe

• Central vision preserved despite peripheral field loss
• Occipital infarcts or haemorrhages