Glare caused by contrast between task and immediate surround. An evaluation of luminance distribution in the field of view

Luminance ratios have historically been used to assess glare. Using data from a previous experiment, this exploratory study investigates the relationship between luminance variations in the field of view (FOV), measured as luminance ratios, and glare sensation in daylit office-like settings. Correlations between glare sensation assessments and luminance ratios between task area, its immediate surround and far surround were calculated. The results indicate that there are certain definitions of contrast ratio which have better correlations with subjective assessments. The inclusion of this type of glare will enhance the existing glare models for better prediction of glare in a wider set of situations.