Table 4.

Summary of main results of studies investigating eye movement behaviors during real-life simulations and everyday tasks All comparisons are between people with PD and HC. PD, Parkinson’s disease; HC, healthy controls; SVM-RFE, support vector machine with recursive feature elimination; *saccadic peak velocity, inter-saccade interval, saccade duration, saccade amplitude

Study	Groups (n)	Task	Main results
Sacrey et al.53	Mild (8) and advanced (7) PD, on medication Age-matched HC (15) Young HC (11)	Reach-to-eat	Advanced PD took longer to move after fixating the food target. After grasping, advanced PD took longer than mild PD to look away from the food target. Music normalized fixation durations.
Sacrey et al.54	PD, tested ON and OFF medication (8) Age-matched HC (8)	Reach-to-eat, with and without background music	Without music: PD OFF took longer to look away after grasping than PD ON and HC. With music: PD OFF exhibited longer engage latency than PD ON and HC. PD ON and OFF took longer to initiate movement towards the target after visual fixation than HC.
Tseng et al.55	PD, on medication (14) Age-matched HC (24) Young HC (18)	1-minute video clip watching	SVM-RFE achieved 90% accuracy differentiating between PD and age-matched HC on 4 oculomotor features*.
Habibi et al.56	PD, varying medication status (27) Age-matched HC (132)	10 one-minute videos with clips changing every 2–4 s	PD exhibited a stronger center bias. Macro-saccade rate was lower in PD. Fixation duration was longer in PD. Saccadic amplitude was smaller in PD.