Computerised Perimetry
Many eye conditions can result in the loss of peripheral vision. Permanent causes of peripheral vision loss include glaucoma, stroke, brain tumours and brain injuries. Temporary causes of peripheral vision loss can stem from migraines.
A computerised perimeter accurately maps out any missing peripheral vision. The results can be used to detect and monitor for any changes in your peripheral vision.
Glaucoma typically produces 'arcuate' or rainbow shaped patterns of vision loss in the early stages.
Strokes are due to bleeding or loss of blood flow to a region of the brain. The brain processes and collates visual information from both eyes. This is why strokes cause vision loss in both eyes (although sometimes this can be asymmetric). We can tell the location of a stroke by analysing the portion of vision affected, and the similarity of the vision loss in both eyes. Strokes can cause bilateral hemianopias (half-vision loss) and quadrantanopias (quarter-vision loss).
Certain brain tumours can also cause peripheral vision loss. A pituitary adenoma is a brain tumour which affects the pituitary gland. The pituitary gland sits very close to where the optic nerves intersect and cross. Pressure from the tumour compresses the optic nerve and causes a special type of visual field defect called a bi-temporal hemianopia (half vision loss on the outer side of vision in both eyes, i.e. right sided vision loss in the right eye and left sided vision loss in the left eye).
A computerised perimeter accurately maps out any missing peripheral vision. The results can be used to detect and monitor for any changes in your peripheral vision.
Glaucoma typically produces 'arcuate' or rainbow shaped patterns of vision loss in the early stages.
Strokes are due to bleeding or loss of blood flow to a region of the brain. The brain processes and collates visual information from both eyes. This is why strokes cause vision loss in both eyes (although sometimes this can be asymmetric). We can tell the location of a stroke by analysing the portion of vision affected, and the similarity of the vision loss in both eyes. Strokes can cause bilateral hemianopias (half-vision loss) and quadrantanopias (quarter-vision loss).
Certain brain tumours can also cause peripheral vision loss. A pituitary adenoma is a brain tumour which affects the pituitary gland. The pituitary gland sits very close to where the optic nerves intersect and cross. Pressure from the tumour compresses the optic nerve and causes a special type of visual field defect called a bi-temporal hemianopia (half vision loss on the outer side of vision in both eyes, i.e. right sided vision loss in the right eye and left sided vision loss in the left eye).
