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Reading saccades that occur within a single line of text are guided by thesize of letters. However, readers occasionally need to make longer saccades(known as return-sweeps) that take their eyes from the end of one line of textto the beginning of the next. In this study, we tested whether return-sweepsaccades are also guided by font size information and whether this guidancedepends on visual acuity of the return-sweep target area. To do this, wemanipulated the font size of letters (0.29 vs 0.39 deg. per character) and thelength of the first line of text (16 vs 26 deg.). The larger font resulted inreturn-sweeps that landed further to the right of the line start and in areduction of under-sweeps compared to the smaller font. This suggests that fontsize information is used when programming return-sweeps. Return-sweeps in thelonger line condition landed further to the right of the line start and theproportion of under-sweeps increased compared to the short line condition. Thislikely reflects an increase in saccadic undershoot error with the increase inintended saccade size. Critically, there was no interaction between font sizeand line length. This suggests that when programming return-sweeps, the use offont size information does not depend on visual acuity at the saccade target.Instead, it appears that readers rely on global typographic properties of thetext in order to maintain an optimal number of characters to the left of theirfirst fixation on a new line.

Do readers use character information when programming return-sweep saccades?