Importance of Luminance Contrast

The majority of people who are blind or vision impaired have some vision. The provision of sufficient luminance-contrast in the design of signage and the choice of TGSIs will enhance access to information for people with vision impairment and for all pedestrians.
The use of luminance-contrasting strips on the nosing of stairs has been proven to improve safety for people who are vision impaired, as well as for all pedestrians.
Similarly, luminance-contrast principles applied to signage will be of benefit to all users. Ref… By

Luminance contrast of TGSIs is the difference in the amount of light reflected from the TGSIs compared to the amount of light reflected from the background or adjacent path of travel. Where the TGSI is an integrated unit,

1. It shall have a minimum luminance contrast of 30% compared to the amount of light reflected from the surface of the adjacent path of travel. Where the TGSIs are discrete units having the same luminance for the sloping sides and upper surface of the truncated cones.

2. The units shall have a minimum luminance contrast of 45% compared to the amount of light reflected from the surface of the adjacent path of travel. Where the TGSIs are discrete units having differing luminance for the sloping sides and upper surface of the truncated cones.

3. The units shall have a minimum luminance contrast of 60% compared to the amount of light reflected from the surface of the adjacent path of travel.

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