Comparison of the pupil card and pupillometer in measuring pupil size.
OBJECTIVE
To determine the difference in pupil size measured with the Colvard pupillometer in mesopic and scotopic luminance and with the Rosenbaum pupil card in mesopic luminance between 2 examiners.


METHODS
Michel Pop Clinics, Montreal, Quebec, Canada.


METHODS
Two examiners used the Colvard pupillometer and the Rosenbaum card to measure pupil size in 58 eyes. The Colvard pupillometer was used in mesopic and scotopic light conditions. The Rosenbaum card was used in mesopic luminance only. Pupil size was evaluated with a 1.0 mm interval scale at the nearest half millimeter.


RESULTS
For the 3 sets of data, the limits of agreement and coefficient of interrater repeatability were calculated and a 2 x 2 factorial analysis of variance was performed. Because of interexaminer bias, measurements done in mesopic luminance with the Rosenbaum card were not statistically different from those with the Colvard pupillometer in scotopic luminance, although interrater repeatability of the Colvard pupillometer (0.8 mm) was superior to that of the Rosenbaum card (1.3 mm).


CONCLUSIONS
Examiner bias was the greatest statistical bias in all sets of measures. Surgeons may want to opt for a "safe" limit of pupil size (ie, 0.5 to 0.8 mm greater than the measured size) when calculating optical zones in refractive surgery. Future devices for pupil measurement should be based on automatic adjustment sizing.
Pop
Mihai
M
Michel Pop Clinics, Montreal, Quebec, Canada.
Payette
Yves
Y
Santoriello
Emma
E
D003941:Diagnostic Techniques, Ophthalmological / Q000295:instrumentation*; D006801:Humans; D007498:Iris / Q000033:anatomy & histology*; D008027:Light; D015588:Observer Variation; D011680:Pupil / Q000502:physiology*; D015203:Reproducibility of Results