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Validation of a method to measure light distortion surrounding a source of glare

Poster Details

First Author: J.Salgado-Borges PORTUGAL

Co Author(s):    H. Ferreira-Neves   R. Macedo-De-Araujo   L. Rico-Del-Viejo   A. Da-Silva   C. Borges   J. Gonzalez-Meijome     

Abstract Details


To validate a new device dedicated to measure the light disturbances surrounding bright sources of light under different sources of potential variability.


CEORLab - Center of Physics, University of Minho, Braga, Portugal


Twenty subjects were involved in the study. Light distortion has been measured using an experimental prototype (Light Distortion Analyzer, CEORLab, University of Minho, Portugal) comprising 24 LED arrays panel at 2 meters. Sources of variability included: intra-session and inter-session repeated measures, pupil size (3 vs 6 mm), defocus (+0.50) correction for the working distance, angular resolution (15 vs 30º), temporal stimuli presentation and pupil size.


Size, shape, location and irregularity parameters have been obtained. At 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 not change with pupil size. Intensity of the central glare source influenced significantly the outcomes. Examination time reduced by 30% when 30º angular resolution was explored instead of 15º.


Measurements were fast and repeatable under the same experimental conditions. Size and shape parameters showed the highest consistency and location and irregularity lower consistency. The system was sensitive to changes in the intensity of the central glare source but not to pupil changes in this sample of healthy subjects.

Financial Disclosure:

One or more of the authors is employed by a for-profit company with an interest in the subject of the presentation

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