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Table 8 Items and scoring rule of SSQ

From: Assessment of eye fatigue caused by head-mounted displays using eye-tracking

 NOD
General discomfort11 
Fatigue 1 
Headache 1 
Eye fatigue 1 
Difficulty focusing 11
Increased salivation1  
Sweating1  
Nausea1 1
Difficulty concentrating11 
Fullness of head  1
Blurred vision 11
Dizzy (eyes open)  1
Dizzy (eyes closed)  1
Vertigo  1
Stomach awareness1  
Burping1  
Total[1][2][3]