Translations:Reading/Web/Accessibility for reading/Repository/Readability research report/59/en

The impact of line height on readability was less universal. One study found that more vertical space between lines of text helps the eye trace out smaller letterforms when fonts are relatively small. Another found that bigger text needs less relative line height (up until a certain point). Our eyeballs need less breathing room when the letterforms are bigger and less fiddly. In a different study, line height did not have a significant impact on fixation duration, but it had a major effect on comprehension, namely that 0.8 line height had a much better comprehension performance than 1.8. In this study, denser line heights lead to better comprehension.$ref