LRV Chair Design Tool
The tools below assist the design process by calculating compliance with legislation and guidance around visual impairment.
The tools below assist the design process by calculating compliance with legislation and guidance around visual impairment.
This tool is designed to aid compliance with ADM [Section 4.7 - 'It is desirable for seating to contrast visually with the surroundings']
Visual Contrast is defined within ADM as a calculation of the difference in Light Reflectance Values (LRV's). In this instance, a minimum of 30 points difference is classed as achieving visual contrast. Visual Contrast for seating is typically measured against the floor. As the user sits, visual contrast between the seat cushion and the floor allows them to position themselves correctly and reduces risk of falls.
This tool is intended for guidance only, to assist the design process. The user is solely responsible for verifying and ensuring compliance with all local regulations and accessibility standards. Spira makes no guarantees regarding the accuracy of the results and expressly disclaims any liability for damages arising from the use or interpretation of this tool.
This tool has been created to aid designers following the best practice principal of achieving a minimum of 30% visual contrast between a seat and the floor beneath.
Visual Contrast for seating is typically measured against the floor. As the user sits, visual contrast between the seat cushion and the floor allows them to position themselves correctly and reduces risk of falls.
The tool below uses the Bowman-Sapolinski formula, as set out in AS/NZS 1428.4.1
This tool is intended for guidance only, to assist the design process. The user is solely responsible for verifying and ensuring compliance with all local regulations and accessibility standards. Spira makes no guarantees regarding the accuracy of the results and expressly disclaims any liability for damages arising from the use or interpretation of this tool.
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