In general, most people find it comfortable to read 7 to 12 words in a line of continuous, or running, text. Doing so makes it easier for your reader to move through the page. Choose pictures that have sufficient contrast between foreground and background. Crop the pictures so that they have a clear border around a central image. When you include pictures on your Web site, provide descriptive text alongside graphic images.
Some people find it easier to get information from text than from pictures.
Glossy paper has a glare that can be difficult to see by people with impaired vision. To increase legibility, use matte paper for all your printed materials. And have no more than 5 lines of text on each slide with no more than 5 words on each line. That way, your audience will find it easier to take in the information you are presenting. To Learn More Adaptive Environments is a Boston based non-profit educational organization dedicated to promoting accessibility and universal design.