Repeated pupil size measurements in refractive surgery candidates.
OBJECTIVE
To evaluate the individual variation in pupil diameter measurements in refractive surgery candidates under standardized conditions over 2 testing sessions using a digital infrared pupillometer.


METHODS
Department of Ophthalmology, University Medical Center Regensburg, Regensburg, Germany.


METHODS
The pupil size in both eyes of consecutive refractive surgery candidates was measured under 2 illumination levels (scotopic at 0.03 lux, low mesopic at 0.82 lux) with a digital infrared pupillometer (Procyon P2000 SA). Before measurement, a standardized dark-adaptation protocol was used. Measurements were taken twice on separate occasions.


RESULTS
The study evaluated 318 eyes of 159 patients with a mean age of 36.3 years +/- 10.2 (SD). The mean interval between measurements was 53 +/- 62.8 days. Despite sufficient power (beta < 0.05), there was no statistically significant difference between 2 consecutive measurements under scotopic and low mesopic illumination.


CONCLUSIONS
Using a standardized dark-adaptation protocol, refractive surgery candidates showed no significant variation in scotopic or low mesopic pupil diameter over 2 testing sessions.
Robl
Christoph
C
Department of Ophthalmology, University Medical Centers, Regensburg, Germany.
Sliesoraityte
Ieva
I
Hillenkamp
Jost
J
Prahs
Philipp
P
Lohmann
Chris P
CP
Helbig
Horst
H
Herrmann
Wolfgang A
WA
D000293:Adolescent; D000328:Adult; D003623:Dark Adaptation; D003941:Diagnostic Techniques, Ophthalmological; D005260:Female; D006801:Humans; D007498:Iris / Q000033:anatomy & histology*; D008027:Light; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D011680:Pupil / Q000502:physiology*; D054140:Refractive Surgical Procedures; D055815:Young Adult