[Computer perimetry of glaucomatous visual field defects at different stimulus sizes (author's transl)]

Abstract

The influence of stimulus size in computer perimetry of central visual field defects was investigated in 30 glaucomatous eyes of 30 patients. 12 eyes had been studied utilizing stimulus size 1 and 3, 18 eyes with stimulus size 3 and 5 at the computer perimeter Octopus (program 31). Using large test targets small scotomata can be overlooked and identified field defects appear smaller and less deep. To evaluate this well-known phenomenon quantitatively by computerized perimetry was the aim of the present study. The mean threshold values in the diseased areas of the glaucomatous fields were about 6--10 db higher with stimulus size 3 than 1 and again 6--10 dB higher with stimulus 5 in comparison to 3. The clinical significance of these findings is discussed for different types of perimetry.