Research Papers: General

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

[+] Author Affiliations
Helena Ferreira-Neves, Rute Macedo-de-Araújo, Laura Rico-del-Viejo, Ana C. da-Silva, António Queirós, José M. González-Méijome

University of Minho, School of Science, Clinical and Experimental Optometry Research Lab, Centre of Physics, Gualtar, Braga 4710-057, Portugal

J. Biomed. Opt. 20(7), 075002 (Jul 06, 2015). doi:10.1117/1.JBO.20.7.075002
History: Received January 21, 2015; Accepted May 4, 2015
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Abstract.  Our objective was to validate a new device dedicated to measure the light disturbances surrounding bright 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, University of Minho, Portugal) comprising twenty-four LED arrays panel at 2 m. Sources of variability included: intrasession and intersession repeated measures, pupil size (3 versus 6 mm), defocus (+0.50) correction for the working distance, 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 not change with pupil size. Intensity of the central glare source significantly influenced the outcomes. Examination time was reduced by 30% when a 30 deg angular resolution was explored instead of 15 deg. Measurements were fast and repeatable under the same experimental conditions. Size and shape parameters showed the highest consistency, whereas location and irregularity parameters showed 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.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Helena Ferreira-Neves ; Rute Macedo-de-Araújo ; Laura Rico-del-Viejo ; Ana C. da-Silva ; António Queirós, et al.
"Validation of a method to measure light distortion surrounding a source of glare", J. Biomed. Opt. 20(7), 075002 (Jul 06, 2015). ; http://dx.doi.org/10.1117/1.JBO.20.7.075002


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