Refraction scotomata in perimetry

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Abstract: Adequate correction is an essential prerequisite for precise perimetry. Therefore, not only the correct glasses have to be chosen, but also their positioning should be properly determined. Otherwise, a distortion of the stimulus grid, as well as a (area enlarging/reducing) distortion of the stimuli themselves, can occur. Therefore, scotomata may be simulated in visual fields which are purely optically evoked (so-called refraction scotomata), because the light stimulus is mapped on an enlarged/reduced retinal area, thereby reducing/increasing light density.

Tübingen Automated Perimeter (TAP-2000, OCULUS Optikgeräte GmbH):

Tübingen Automated Perimeter (TAP-2000) stimulus grid:

high spatial resolution due to 191 test locations!

High myopia corrected with a biconcave lens:

TAP-2000 stimulus grid from the viewpoint of a high myopic person corrected with a biconcave lens:

High hyperopia corrected with a biconvex lens:

TAP-2000 stimulus grid from the viewpoint of a high hyperopic/aphakic person corrected with a biconvex lens
(annular scotoma):

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