Visual Pathway Lesions Interactive Lesson

Visual Pathway Lesions Interactive Lesson

START GAME

Press on the lesions to learn about the resulting visual field defect

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FIND THE LESION(S)

Please press on two lesions which correlate with the following visual defect:

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FIND THE LESION(S)

Please press on three lesions which correlate with the following visual defect:

NEXT

FIND THE LESION(S)

Please press on one lesion which correlates with the following visual defect:

NEXT

FIND THE LESION(S)

Please press on one lesion which correlates with the following visual defect:

NEXT

FIND THE LESION(S)

Please press on two lesions which correlate with the following visual defect:

NEXT

FIND THE LESION(S)

Please press on two lesions which correlate with the following visual defect:

NEXT

CONGRATULATIONS! YOU'VE COMPLETED THE EXERCISE

FEEDBACK

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RESOURCES

Monocular Vision Loss

Complete lesion at the optic nerve will lead to entire loss of sight in the affected eye. Causes:

• Optic neuritis - Inflammation (MS)
• Amaurosis Fugax - TIA
• Trauma - direct nerve injury
• Compression - space occupying lesion

Central Scotoma

Blind spot in the center of the visual field, surrounded by normal peripheral vision due to a lesion in the optic nerve. Optic nerve carries signals to the macula, which is responsible for central vision.

Bitemporal Haemanopia

Compression of the bilateral decussating nasal fibres at the chiasm leads to temporal vision loss in both eyes.Nasal fibres are responsible for temporal vision. Causes

• Pituitary Tumour - Upper quadrant > lower quadrant
• Craniopharyngioma - Lower quadrant > upper quadrant
• Aneurysm - anterior communicating artery
• Meningioima

Contralateral Homonymous Hemianopia

Same half of vision loss in both sides caused by contralateral damage.Causes

• Stroke
• Intracerebral hemorrhage
• Brain tumours
• Multiple sclerosis

Loss of vision in the upper quadrant of the same side in both eyes, from damage to the opposite side of temporal lobe optic radiations (Meyer's loop). Normally carries information to inferior retina(upper visual field). "Pie in the Sky" visual field defect. Cause:

• Stroke - temporal lobe
• Brain tumour - temporal glioma, metastasis
• Trauma involving temporal lobe

Contralateral Superior Quadrantopia

Contralateral Homonymous Hemianopia

Same half of vision loss in both sides caused by contralateral damage.Causes

• Stroke
• Intracerebral hemorrhage
• Brain tumours
• Multiple sclerosis

Contralateral Inferior Quadrantopia

Damage to the optic radiations or the upper calcarine fissure leads to "Pie on the Floor" visual defect on the contralateral side of the lesion. Remeber PITS (Parietal Inferior, Temporal Superior) Causes: (Parietal lobe visual pathway damage)

• Parietal lobe stroke - MCA
• Head trauma involving parietal region
• Intracerebral haemorrhage parietal lobe
• Brain tumour - parietal glioma, metastasis

Contralateral Inferior Quadrantopia

Damage to the optic radiations or the upper calcarine fissure leads to "Pie on the Floor" visual defect on the contralateral side of the lesion. Remeber PITS (Parietal Inferior, Temporal Superior) Causes: (Parietal lobe visual pathway damage)

• Parietal lobe stroke - MCA
• Head trauma involving parietal region
• Intracerebral haemorrhage parietal lobe
• Brain tumour - parietal glioma, metastasis

Contralateral Homonymous Hemianopia

Same half of vision loss in both sides caused by contralateral damage.Causes

• Stroke
• Intracerebral hemorrhage
• Brain tumours
• Multiple sclerosis

Contralateral Superior Quadrantopia

Loss of vision in the upper quadrant of the same side in both eyes, from damage to the opposite side of temporal lobe optic radiations (Meyer's loop). Normally carries information to inferior retina(upper visual field). "Pie in the Sky" visual field defect. Cause:

• Stroke - temporal lobe
• Brain tumour - temporal glioma, metastasis
• Trauma involving temporal lobe

Contralateral Homonymous Hemianopia with Macular Sparing

Visual defect where the same half of the visual field, opposite to the lesion, is lost in both eyes with preservation of the central (macular) vision. Caused. by damage to the primary visual cortex(occipital lobe). Macula remains intact due to dual blood supply from both PCA and MCA Causes: Strokes: occipital lobe - PCA Trauma Tumours Occipital lobe haemorrhage

Helpful Resources

Simple look into visual field lesions

Extensive look into visual field lesions