|Title||Effect of contrast and background color on eye movements during reading|
|Author, Co-Author||Juan Carlos Ondategui Parra, Rosa Borras-Garcia, Ainhoa de Castellarnau, Elvira Peris March|
Purpose: To study the effect of contrast and background color on eye movements during reading. For ocular movements the fixation, saccades and regressions were studied.
Methods: We evaluated a total of 25 healthy young university students (21,72 ± 2,24 years). Ocular motility was evaluated by an eye tracker (Eye Link 1000 plus). All texts are projected onto a computer screen located at 50 cm. It carried a total of seven trials with different conditions of contrast (high, medium, low and reversed) and background color (white, blue and yellow). Number, duration, width and mean speed of saccades and regressions movements were measured. Duration and length of the fixations were calculated. Different texts of ten lines of a commercial book for each of the tests to avoid learning effects were used. The eight centerlines records were analyzed.
Results: Changes in contrast modified significantly the amplitude of fixations (p < 0.01) that decreasing for of contrast medium, low and reversed and a tendency to increase the duration of saccades in conditions of reversed contrast (p = 0.058). The change of the background color also affects to ocular motility decreasing in both yellow and blue background (p < 0.01), the number of saccades and and its amplitude increases with blue and yellow background (p < 0.01) and finally, the frequency of saccades per second and its amplitude increases on blue background and the number of saccades per second increases on yellow background (p < 0.01).
Conclusions: During reading, the text characteristics changes in contrast and background color affect several parameters of ocular motility causing these movements are less accurate. This effect is greatest in reversed contrast condition and blue background.
|Affiliation of Co-Authors||Centre for Sensors, Instruments and Systems Development (CD6, Centre for Sensors, Instruments and Systems Development (CD6, Centre Universitari de la VisiÃ³ (CUV)|