Our objective was to validate a new device dedicated to measure the light disturbances surroundingbright sources of light under different sources of potential variability. Twenty subjects were involved in the study.Light distortion was measured using an experimental prototype (light distortion analyzer, CEORLab, Universityof Minho, Portugal) comprising twenty-four LED arrays panel at 2 m. Sources of variability included: intrasessionand intersession repeated measures, pupil size (3 versus 6 mm), defocus (þ0.50) correction for the workingdistance, angular resolution (15 deg versus 30 deg), temporal stimuli presentation, and pupil size. Size,shape, location, and irregularity parameters have been obtained. At a low speed of presentation of the stimuli,changes in angular resolution did not have an effect on the results of the parameters measured. Results did notchange with pupil size. Intensity of the central glare source significantly influenced the outcomes. Examinationtime was reduced by 30% when a 30 deg angular resolution was explored instead of 15 deg. Measurementswere fast and repeatable under the same experimental conditions. Size and shape parameters showed thehighest consistency, whereas location and irregularity parameters showed lower consistency. The systemwas sensitive to changes in the intensity of the central glare source but not to pupil changes in this sampleof healthy subjects.
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