Table 2.

Summary of research questions.

Questions and answers			Reference
Q1: What research questions are answered by eye-tracker technology?
		System effectiveness, efficiency, and user satisfaction	[33-36,40,41]
		Linkage between human visual stimulus and cognitive processing	[37]
		The variability of human performance	[38,39]
Q2: What types of HITs were evaluated using an eye tracker?
	Technology type by functionality
		Health information website interfaces	[38-40]
		Surgical interfaces	[34]
		Decision support systems	[33,35,36]
		Computerized provider order entry systems	[37]
		Symptom and quality-of-life information systems	[41]
	Technology type by target users
		General public	[38-40]
		Patients	[33,41]
		Physicians	[34-37]
Q3: What is the experimental apparatus of the usability test?
	Experimental apparatus by technology
		Developed computer program	[33,34,38,40]
		Simulated prototype	[35,36,41]
		Screenshots	[37,39]
	Experimental apparatus by eye tracker
		On-screen eye tracker	[33,38,40,41]
		Mobile eye tracker	[34-36]
		Head-mounted eye tracker	[37,39]
Q4: What did the eye tracker measure and how was data analyzed?
	Eye-tracker data collected
		Fixation duration	[33,34,38-40]
		Eye movement location	[35-37]
		Fixation count in area of interest	[34,38]
	Eye-tracker data analyzed
		Heat map	[33,34,40]
		Gaze plot	[35,36,41]
		Statistical analysis	[34,37-39]
Q5: How is eye-tracker technology combined with other usability methods?
		Think-aloud protocol	[33,38,41]
		System Usability Scale	[33,35,36]
		Questionnaire	[34]
		Posttest interview	[36]
		Metrics measurement	[39]
		Feedback Capture After Task	[39]