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Cherell Lemons, Min Kong, Danica Quicho, Arlene Flores, Danielle Ringle, Katalina Rowland, Kaydee McCray, Jennifer Kurtz, Pinakin Gunvant Davey; Repeatability of measurements obtained using an automated pupilometer. Invest. Ophthalmol. Vis. Sci. 2016;57(12):4561.
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© ARVO (1962-2015); The Authors (2016-present)
The pupillary measurements form an integral part of eye examinations particularly clinical considerations of glare, cataract and refractive surgery. We sought to evaluate the repeatability of the automated NeurOptics® VIP™-200 Pupillometer.
A hundred eyes of fifty individuals’ age range 22 to 35 were examined for the study purposes. Subjects underwent an ocular examination that included, distance and near vision, contrast sensitivity measurements, fundus photography and measurements with Optical Coherence Tomography. Pupillary measurements were obtained twice using NeurOptics® VIP™-200 Pupillometer at scotopic, low mesopic, high mesopic and photopic lighting conditions by trained observers. A time interval of 30 minutes was provided between two sets of measurements and subjects were allowed to dark adapt for 1-2 minutes prior to any measurements being performed.
Figure 1 provides the pupillary measurements under various illumination conditions. The mean difference in pupillary measurements obtained at attempt 1 and attempt 2 were 0.42, 0.62, 0.79 and 0.73 for the scotopic, low mesopic, high mesopic and photopic conditions respectively which was significant (Paired samples t-test, p<0.001 for all comparisons). The 95% limits of agreement of pupillary measurements is also given in figure 1 and are on average -1.99 to +0.70.
Small yet significant differences in pupil measurements can occur during repeat measurements which is in the range of half a millimeter when measuring with NeurOptics® VIP™-200 Pupillometer. One should consider multiple measurements at different times and averaging the values if accurate pupil dimensions are needed.
This is an abstract that was submitted for the 2016 ARVO Annual Meeting, held in Seattle, Wash., May 1-5, 2016.
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