Pupillometric Comparison between Goldmann Perimeter versus Colvard Pupillometer and Procyon-Video Pupillometer in Photorefractive Therapy
Kampmeier J., Mueller A., Schnaidt A., Buchwald H. J., Lang G. E., Lang G. K.
Dept. of Ophthalmology, Ulm University
Purpose: The measurement of the pupil size at mesopic and scotopic illuminations is important in the preoperative diagnostic before photorefractive therapy to avoid postoperative vision problems (halos).
Method: Two examiners performed measurements of pupil sizes of 50 healthy volunteers (n=100 eyes) using the Goldmann-Perimeter (1.40 lux), the Colvard-Pupillometer (0 lux) and the Procyon-Video-Pupillometer (scotopic 0.04 lux; mesopic low 0.40 lux; mesopic high 4.00 lux).
Results: Reproducible and reliable results were achieved with all three devices. The average pupil size was 4.39 ±0,62 mm with the Goldmann-Perimeter, with the Colvard-Pupillometer 6.80 ±0,81 mm and with the Procyon-Video-Pupillometer at the illumination scotopic 7.06 ±0,71 mm, mesopic low 6.24 ±0,80 mm and mesopic high 4.65 ±0,73 mm. Between the Goldmann-Perimeter and the Colvard-Pupillometer, a mean difference of 2.40 ±0,82 mm was found. The mean interindividual differences were 0.14 ±0,30 mm using the Goldmann-Perimeter and 0.16 ±0,40 mm using the Colvard-Pupillometer.
Conclusions: The Goldmann-Perimeter, available in many offices, enables a simple fair and reliable method to measure precisely the mesopic pupil size. To estimate the scotopic pupil size, 2.4 to 2.6 mm should be added.
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