Visual Field Analyzer
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The visual field evaluates your peripheral vision. White areas indicate good peripheral vision. Dark areas indicate defective vision. In this normal field, the black spot represents the blind spot, which is present in everyone's visual field. The blind spot corresponds to your optic nerve head, an area of the retina that does not have any visual receptors.
Glaucoma causes a gradual loss of peripheral vision, which is usually undetected by a patient until it is too late. Routine eye examinations can detect this condition before serious loss of vision occurs. Glaucoma is easily treated with eye drops or surgical procedures. This is an example of moderate glaucoma.