Summary
Discomfort glare is driven more by the spatial contrast properties (edges) of a light source than by the total amount of light entering the eye, suggesting that luminaire design should prioritize source size and edge contrast management. Lighting installations can potentially reduce glare discomfort while maintaining adequate illuminance by selecting appropriately sized light sources.
Key Findings
- Discomfort glare thresholds varied less when expressed as retinal illuminance than as pupil-plane illuminance or light flux across different glare-source sizes and background luminances, indicating retinal illuminance is the more stable predictor.
- A two-stage model — photoreceptor saturation followed by summation of an edge-response signal at the glare-source boundary — accurately predicted discomfort glare thresholds across experimental conditions.
- Glare discomfort in central vision is more closely associated with contrast-defined edges of the source than with overall luminous flux, implying that reducing source size (while maintaining illuminance) can mitigate discomfort.
Categories
Eye Health & Vision: Investigates the physiological mechanisms of discomfort glare, including retinal illuminance thresholds and photoreceptor saturation.
The Science of Light: Develops a two-stage model linking photoreceptor saturation and edge-response summation to predict discomfort glare thresholds under varying photometric conditions.
Author(s)
Y Jia
Publication Year
2014
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