A video eye-tracking systems allows the fast recording of reading eye-movement
data.
Recorded saccades during the reading speed test.
Only in the "minimum visual field of reading" the text is perceived clearly.
To achieve a clear perception of the adjacent letters, saccadic movement
has to be performed. Thus, reading is performed as a regular pattern of
saccades and fixations along a text line and a return sweep to the beginning
of the next line.