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) 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
This page is still under construction!
Copyright © by Dr. Wolfgang Fink
Last modified: Tue 06 Aug 2002 at 08:31 AM