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Table 2 Mean values and changes of optometry indicators in the main and control experiments

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

ExperimentIndicator1st measurement2nd measurement3rd measurement4th measurement
Main experimentBCC(D)0.14 ± 0.080.26 ± 0.340.36 ± 0.36{0.50} ± {0.40}
NRA (D)2.35 ± 0.60{2.15} ± {0.61}{2.00} ± {0.62}{1.79} ± {0.64}
PRA (D)− 2.74 ± 1.55− 2.40 ± 1.50− {2.11} ± {1.4}− {1.78} ± {1.33}
PR (mm)5.37 ± 0.625.21 ± 0.60{5.08} ± {0.6}{4.93} ± {0.62}
PL (mm)5.29 ± 0.675.10 ± 0.63{4.95} ± {0.65}{4.79} ± {0.65}
LTR (mm)3.95 ± 0.363.90 ± 0.363.86 ± 0.36{3.79} ± {0.36}
LTL (mm)3.95 ± 0.353.89 ± 0.353.86 ± 0.36{3.77} ± {0.35}
Control experimentBCC(D)0.14 ± 0.280.14 ± 0.280.14 ± 0.280.14 ± 0.28
NRA (D)2.35 ± 0.602.35 ± 0.602.35 ± 0.602.35 ± 0.60
PRA (D)− 2.74 ± 1.55− 2.74 ± 1.55− 2.74 ± 1.55− 2.74 ± 1.55
PR (mm)5.37 ± 0.625.37 ± 0.625.37 ± 0.615.37 ± 0.62
PL (mm)5.29 ± 0.675.29 ± 0.675.29 ± 0.665.29 ± 0.68
LTR (mm)3.95 ± 0.363.95 ± 0.363.94 ± 0.363.95 ± 0.36
LTL (mm)3.94 ± 0.353.95 ± 0.353.95 ± 0.353.95 ± 0.36
  1. Values of indicators were shown as mean ± standard deviation (SD)
  2. Compared with 1st measurement, \(\hbox {P}<0.05\) were characterized in italics