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Measurement of the Scotopic Pupil, Comparing the Colvard Pupillometer (COP) with the Combined Integrated Pupillograph (CIP)

Wessely D., Kampik D., Hussein S., Lieb W.,
Bayerische Julius-Maximilians-Universität Würzburg, Universitäts-Augenklinik (Würzburg)

Background: The scotopic pupil diameter has to be examined before any refractive surgery of the cornea, because a disparity of the scotopic pupil diameter and the optical effective zone leads to blinding, reduced scotopic visual acuity and „halos“.
Method: After adaption to scotopic conditions for 2 min, the pupil width of 58 eyes of 29 healthy persons (21 females, 8 males), with an age from 23 to 58 years (mean 37,1) was measured by two investigators on both eyes. This measurement was done under standardized illumination with the Compact Integrated Pupillograph CIP (AMTech) first and was then repeated under identical conditions with the Colvard Pupillometer COP (OASIS Medical).
Results: The mean size of the scotopic pupil was with both devices on the right eye 6,3 mm (STD: CIP 0,98, COP 1,06) and on the left eye 6,2 mm (STD: CIP 1,04, COP 1,15). There were no significant differences of the mean of the pupil diameter between the CIP and the COP.
Conclusions: This results demonstrate, that the scotopic pupillary size doesn`t differ significantly between the Compact Integrated Pupillograph (CIP) and the Colvard Pupillometer (COP), also the results of the measurements are highly reproducible. The CIP and the COP are suitable to determine the scotopic pupil size before corneo-refractive operations.