Visual Field Testing

The visual field test is a subjective measure of central and peripheral vision, or “side vision,” mapping the sensitivity of the optic nerve. This is useful in assessing the health of the optic nerve. It is possible to monitor damage caused to the nerve by conditions such as glaucoma, poor blood flow, multiple sclerosis or proximal tumour type lesions. Usually, the visual field test is taken once a year but depending on the severity of the condition, David may decide to check your visual field more frequently.

A visual field test maps out what your world looks like to you. It measures the area of vision, or how wide of an area your eye can see. In the picture above the left is a normal visual field while the right is an abnormal one with defects involving both the central and peripheral vision. 

The visual field shows changes that are not noticed by the patient until the damage is severe. Other diseases, such as cataract, stroke, macular degeneration and diabetes, can also influence the visual field which David will take these possible effects on your exam when interpreting the results.


 

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