There are major uncertainties in the existing glare prediction models which makes them only partially capable of predicting user responses to visual environments. The models are particularly limited when predicting glare in spaces with large non-uniform glare sources; for example a daylit office (Fisekis et al., 2003; Bellia et al., 2008; Clear, 2013; Boyce and Smet, 2014). There are also large differences in the interpersonal perception of glare. Eye colour, age and gender have been investigated but have been shown to have little to no effect on glare perception. This could be an indication that another attribute has an impact on glare perception, such as contrast sensitivity or improperly corrected eyesight (Osterhaus and Bailey, 1992; Wienold, 2009)