Gaze behavior in open-angle glaucoma patients during visuo-cognitive-motor tasks: a cross-sectional study

This study investigated gaze behavior during visuo-cognitive-motor tasks with a change of movement direction in glaucoma patients and healthy controls. Nineteen glaucoma patients (10 females, 9 males) and 30 healthy sighted controls (17 females, 13 males) participated in this cross-sectional study. Participants performed two visuo-cognitive-motor tasks with a change of movement direction: (i) the "Speed-Court-Test" that involved stepping on different sensors in response to a visual sign displayed on either a large or small screen (165″ and 55″, respectively); (ii) the "Trail-Walking-Test" that required walking to 15 cones labeled with numbers (1-8) or letters (A-G) in an alternately ascending order. During these tasks, the time needed for completing each task was determined and the gaze behavior (e.g., saccade duration, fixation duration) was recorded via eye tracking. Data were analyzed with repeated measures analyses of covariance (ANCOVA; GROUP × SCREEN) and one-way ANCOVA. No differences between groups were found for the time needed to complete the tasks. However, during the "Trail-Walking-Test", the fixation duration was longer for glaucoma patients than for controls (p = 0.016, <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msubsup><mml:mi>η</mml:mi> <mml:mrow><mml:mtext>p</mml:mtext></mml:mrow> <mml:mn>2</mml:mn></mml:msubsup> </mml:math> = 0.131). Furthermore, during the "Speed-Court-Test", there was a screen size effect. Irrespective of group, saccade amplitudes were lower (p < 0.001, <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msubsup><mml:mi>η</mml:mi> <mml:mrow><mml:mtext>p</mml:mtext></mml:mrow> <mml:mn>2</mml:mn></mml:msubsup> </mml:math> = 0.242) and fixation durations were higher (p = 0.021, <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msubsup><mml:mi>η</mml:mi> <mml:mrow><mml:mtext>p</mml:mtext></mml:mrow> <mml:mn>2</mml:mn></mml:msubsup> </mml:math> = 0.125) for the small screen. Fixation durations were longer in glaucoma patients during the cognitively demanding "Trail-Walking-Test", which might indicate a strategy to compensate for their visual impairment.