Pupil size assessment in emmetropic and myopic eyes

Document Type: Original article

Authors

1 1. Student Research Committee, Mashhad University of Medical Sciences, Mashhad, Iran 2. Department of Optometry, Mashhad University of Medical Sciences, Mashhad, Iran

2 1.Student Research Committee, Mashhad University of Medical Sciences, Mashhad, Iran 2. Department of Optometry, School of Paramedical Sciences, Mashhad University of Medical Sciences, Mashhad, Iran

3 1. Department of Optometry, Mashhad University of Medical Sciences, Mashhad, Iran 2. Refractive Errors Research Center, Mashhad University of Medical Sciences, Mashhad, Iran

10.22038/rcm.2020.50392.1328

Abstract

Purpose: To determine the influence of age and gender on pupil size under different luminance conditions in emmetropic and myopic healthy eyes using Keratograph 4 topography.
Methods: Two hundred twenty-one eyes from 221 subjects were included in the present study. After complete ocular examination, the undilated pupil diameters were measured using pupilometer software of Keratograph 4 (OCULUS, Wetzlar, Germany) with a sequence of 9.8 seconds of scotopic stimulus (0.1 lux) and 0.2 seconds of photopic stimulus (150 lux), repeated 5 times automatically. At the end of the procedure, the software provides maximum and minimum values (scotopic and photopic) of pupil diameter. The age, gender and refraction related changes of the pupil size was evaluated in different luminance conditions.
Results: Of a total of 221 participants who completed the study, 122 (85 female) were myopes (MSE: -2.18±1.69 D, age: 26.03±6.98 years) and 99 (66 female) were emmetropes (MSE: -0.11±0.27 D, age: 28.05±10.17 years). Considering refractive groups, pupil size was larger in myopes than emmetropes in both luminance conditions (p

Keywords