Computergesteuerte quantitativ-statische Perimetrie nach panretinaler Argon-Laser-Koagulation bei Retinopathia diabetica

Abstract

Computerized threshold perimetry of the central 30 degrees was performed on 69 eyes of 36 patients (men and women of all age groups and with different types of diabetes) one day before and one month after panretinal photocoagulation by argon laser. An average of 900 spots were placed in a chessboard pattern in three sessions (central size 100 microns, midperiphery 200 microns, periphery 500 microns). Only patients with a visual acuity of 20/60 or better were admitted to the study. Twenty-seven (39%) of the eyes examined had absolute scotoma (corresponding to spot III/4 on the Goldmann perimeter) even before photocoagulation; in 20 eyes (29%) some new absolute scotomata, albeit small, were seen. In the outer ten degrees of the central visual field area examined relative scotomata are the average finding. The macular region showed no threshold reductions.

Function of the Diabetic Retina after Panretinal Argon Laser Photocoagulation

“…2, 7, 16, 21, 40, 46, 48]. After panretinal laser coagulation, prolonged additional scotoma can be detected in some patients [1,2,7,16,20,43]. In the present investigation, this was also ver ified by means of computed static perimetry.…”

Central Visual Field Changes after Panretinal Photocoagulation in Proliferative Diabetic Retinopathy

“…Our procedure however differs in some points from that of these au thors concerning both methodology (two groups of patients, different type of PRP appli cation) and findings. While our findings showed improvement of the visual field after PRP within the 15-degree area in group B. Becker and Schmitz [6] did not observe any improvement. On the contrary they found ad ditional absolute scotoma within the visual field area of 30° after PRP.…”

“…The additional scotoma may also be due to the energy in tensity used in the area around the posterior pole. Except for the above-mentioned differ ence concerning the central visual field we also noted that the constriction of the central part of the visual field was less in our cases especial ly in group B than in those of Becker and Schmitz [6].…”

“…The changes occurring in the visual field after PRP in the proliferative type of diabetic retinopathy have also been studied by Frank [2], Suziki et al [3], Gerke et al [4], Blanken ship [5] and Becker and Schmitz [6].…”

“…The visual fields within the central 30-degree area in the same disease after PRP were also checked by Becker and Schmitz [6] who used the Allergan-Humphrey analyser perim eter (30-1 threshold). Our procedure however differs in some points from that of these au thors concerning both methodology (two groups of patients, different type of PRP appli cation) and findings.…”