Degree of eye opening: A new discomfort glare indicator. (June 2015)

• Record Type: Journal Article
• Authors: Yamin Garretón, J.A.; Rodriguez, R.G.; Ruiz, A.; Pattini, A.E.
• Is Part Of: Building and environment. Volume 88(2015)
• Page Start: 142
• Page End: 150
• Publication Date: 2015-06
• Subjects: Daylight glare index -- Visual comfort -- Ocular indicator -- Daylight; LS source luminance -- ω solid angle of the source -- Lb background luminance -- Emin minimum illuminance -- Emean mean illuminance -- Ey vertical illuminance at the eye -- Eh horizontal illuminance at work space -- Ev vertical illuminance at the center of the computer screen -- Eg horizontal grid illuminance; Buildings -- Environmental engineering -- Periodicals; Building -- Research -- Periodicals; Constructions -- Technique de l'environnement -- Périodiques; Electronic journals; 696
• DOI: 10.1016/j.buildenv.2014.11.010
• Languages: English
• ISSNs: 0360-1323

Abstract

Abstract: The degree of eye opening (DEO) is proposed as a new indicator of glare in sunny climates in the presence of direct sunlight. A laboratory experiment was carried out ( n = 20) in a simulated office space where volunteers performed computer office tasks. Four lighting situations, based on ranges of vertical illuminance at the eye level were evaluated. By means of a visible spectrum eye-tracker DEO was registered in each scenario. The proposed indicator was obtained by mathematical iterations and showed a good correlation with: vertical illuminance at the eye ( r = −0.503; α = 0.0001), Daylight Glare Probability (DGP) ( r = −0.649; α = 0.0001) and Glare Sensation Vote (GSV) ( r = −0.580; α = 0.0001). This new indicator operates in a broad range of lighting conditions, from a low vertical illuminance at the eye scenario with diffuse daylight to a very high vertical illuminance at the eye scenario with uncontrolled direct sunlight. The proposed new indicator satisfies the following criteria: high validity, reliability, diagnostic power and acceptability and it also addresses unresolved aspects of current glare predictive models: GSV, DGP and DGI. Highlights: A new objective indicator of glare was developed: degree of eye opening (DEO). DEO is sensitive to vertical illuminance at the eye ( p = −0.503; s = 0.0001). DEO overcomes the limitations of glare prediction models. The proposed ocular indicator has a post occupational use and operates in a broad light range.