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(Course Logo: Adult walking with cane and holding a child's hand)Designing for the Life Span Segment 3

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Slide 24

Slide 24 Content

Glare is one of the most significant problems within the domain of control by the architect, interior designer and product designer. Control of lighting begins with understanding the three types of glare produced by natural and man-made illumination sources and reflective surfaces. These types of glare are:


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Glare is the unwanted illumination that makes tasks requiring appropriate lighting more difficult. Glare is present in both high and low levels of illumination. Direct glare- is unwanted illumination from the source of illumination, indirect glare - reflected from a surface, and specular glare that is that starburst seen on highly polished surfaces or while driving at night - from on-coming headlights. In all instances where glare is present, there should be an effort to reduce it. This may take the form of modifying the environment itself, changing the type of lighting, or shielding the human eye from the source of glare using protective eyewear or shading.

Older adults are more highly susceptible to glare owing to increased opacity of the lens and cornea as well as other changes to the eye. Glare hinders the ability to negotiate environments properly or to perform tasks.


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