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Perform the Amsler Grid test to screen for small defects near fixation
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Trap:
because the Amsler Grid test requires patients to outline their own visual field defects, they must see them distinctly enough to mark the defects; also, remember that this test is limited to detecting defects within 10 degrees of fixation
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Perform confrontation visual field testing to screen for large defects
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Trap:
confrontation visual field testing detects only dense hemianopias and altitudinal defects
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Perform bowl perimetry, the most sensitive method to detect visual field defects
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Trap:
as sensitive as bowl perimetry is, it requires patient attention and cooperation—which are often missing!
