Comparison of the Colvard, Procyon, and Neuroptics Pupillometers for Measuring Pupil Diameter Under Low Ambient Illumination

Abstract

Pupil diameters under both light conditions were largest with the Neuroptics pupillometer and smallest with the Procyon. The most "examiner independent" Procyon pupillometer performed poorly. The underestimation of the pupil diameter might have severe consequences for refractive surgery patients. The Neuroptics pupillometer showed a high interobserver agreement and repeatability and therefore high safety.