Table 2

Vertical and horizontal disc diameter measurements (VDD and HDD)

Study AStudy B
Pupil sizeUndilatedDilatedUndilatedDilated
SubjectsN=52N=34N=45N=42
VDD differences
(observer 1 − observer 2)
Mean (mm)0.05570.054400.0071
Range (mm)−0.3 to 0.4−0.15 to 0.2−0.2 to 0.3−0.4 to 0.35
95% limit of agreement0.24040.16070.24810.2297
F testp=0.0125p=0.609

HDD differences
(observer 1 − observer 2)
Mean (mm)0.00960.01470.00780.0417
Range (mm)−0.3 to 0.4−0.1 to 0.2−0.35 to 0.25−0.2 to 0.3
95% limit of agreement0.26960.17320.24630.2659
F testp=0.0063p=0.62