Regression

In the context of reading and eye tracking, a regression is a backward eye movement (right-to-left in left-to-right scripts) where the reader returns to previously read text. Regressions typically occur when a reader has difficulty understanding a word or passage and needs to re-read it. People with dyslexia make significantly more regressions than typical readers, reflecting the language processing difficulties they experience. Regression frequency is an important metric in reading research and accessibility evaluation, as it indicates where readers struggle with content comprehension or text presentation.