23 Actionable Lessons from Eye-Tracking Studies
Scientific Web Design: 23 Actionable Lessons from Eye-Tracking Studies provides recommendations to use in your web designs based on findings of various eye-tracking studies.
6. Show numbers as numerals. Readers will find it much easier to find factual information on your site if you use numerals instead of writing out numbers. Remember, you’re writing for readers that are going to be primarily scanning your site, so make it easier for them to find what they need and keep them interested.

