design for sight

A Programming and Design Guide for Low Vision



Aging and Vision Loss

3.4% of the population has a vision disability (United States Census Bureau 2010). This includes as many as 6.9% of people over age 65. This roughly equates to 2.5 million people over 65 with low vision. Low vision is described as corrected vision of 20/70 or worse which means that with glasses, your visual acuity is only 20/70 in your good eye. Clinically blind is 20/200 with normal correction. By 2030 there will be more people over age 65 than under age 17. As our population ages there will be larger numbers of people with low vision who have difficulty navigating public transportation, healthcare facilities, and public buildings unless designers can take a more sensitive approach to low vision issues in the visual environment. By considering components of low vision design early in a project, buildings can be more sustainable and comfortable for people of all abilities.

red sphere

Luminance
Contrast

the ratio between the luminance values of adjacent surfaces

orange sphere

Value
Contrast

is measured as the ratio of the Light Reflectance Values (LRV) of two colors

green sphere

Object
Placement

consistent, repetitive, placement of signage and landmarks aids wayfinding

blue sphere

Luminance
Placement

affects the contrast and color rendering of interiors

Design for Low Vision

This research seeks to assist designers and engineers in planning accessible spaces that provide for the needs of the aging eye and the portion of our population with low vision. It is based on an analysis of existing resources and design recommendations for the visually impaired. Design for Sight takes a two-step approach: first, identify the vision related problems in the built environment. Second, develop best practices of low vision design for interior spaces. This research has identified fourteen typologies in four categories: Luminance contrast, Value contrast, Luminance placement, and Object placement. Design for Sight incorporates images, measurements, resources, and descriptive analysis for each typology to provide an educational and analytical tool for addressing the needs of people with low vision in the built environment. Since this guide is intended to be used by design practitioners working in the field, we tested its usability to evaluate the interior space at a regional vision clinic. The evaluation consisted of an analysis and suggested design solutions. The protocol and findings of that evaluation can be found in the appendix.

Additional Resources

In order to be a complete resource for design practitioners Design for Sight offers additional resources that add depth to the summary information in each typology. This design guide incorporates sections on glare indices, luminance mapping, and value contrast.

I hope that you find Design for Sight to be helpful and educational, and that it inspires you to advocate for the improvement of the visual environment for people of all abilities.



Erin Schambureck, IDEC, IIDA, ASID
Assistant Professor
NCIDQ #24260


erin.schambureck@ttu.edu




Texas Tech University
Department of Design





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