Graphics & Colour Blindness

Approximately 5 – 10% of the student population are likely to experience some form of colour blindness. Vischeck is a website that simulates different types of colour blindness in order to test the perceivability of images in colour:

Try VisCheck for image files

Another useful tool is free Color Oracle, a colour blindness simulator for Window, Mac and Linux. It takes the guesswork out of designing for colour blindness by showing you in real time what people with common colour vision impairments will see (taken from

Writing Alternate Text for Images

Writing descriptive yet concise alternate text is actually harder than it sounds. But it’s an important skill in rendering images accessible to students with a visual disability. WebAIM has a great primer on the appropriate use of alternate text:

WebAIM’s guide to writing alternate text

Check out Algonquin College’s simple and concise instructional video on how to apply alt text to images in Microsoft Suite, including how to format charts and graphs to be accessible for screen-reader technology.