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Table 3 Mean values and changes of eye movement features in the main experiment

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

Eye movement features

1st measurement

2nd measurement

3rd measurement

4th measurement

Number of fixation points

\(43.12\pm 7.97\)

\({ 39.50}\pm { 8.20}\)

\({ 35.62}\pm { 8.98}\)

\({ 30.19}\pm { 9.61}\)

Total duration of fixation points (s)

\(16.97\pm 0.56\)

\(16.88\pm 0.87\)

\({ 16.72}\pm { 1.08}\)

\({ 16.05}\pm { 1.75}\)

Mean duration of fixation points (s)

\(0.41\pm 0.12\)

\({ 0.46}\pm { 0.15}\)

\({ 0.53}\pm { 0.29}\)

\({ 0.67}\pm { 0.57}\)

Variance of fixation durations (\(s^{2}\))

\(0.08\pm 0.06\)

\({ 0.13}\pm { 0.09}\)

\({ 0.40}\pm { 0.31}\)

\({ 0.91}\pm { 0.63}\)

Times of blinking

\(2.57\pm 2.44\)

\(4.65\pm 3.51\)

\({ 6.79}\pm { 4.50}\)

\({ 10.21}\pm { 6.18}\)

Total duration of blinking (s)

\(0.49\pm 0.49\)

\(0.95\pm 0.77\)

\({ 1.48}\pm { 1.05}\)

\({ 2.55}\pm { 1.73}\)

Mean duration of blinking (s)

\(0.16\pm 0.07\)

\(0.20\pm 0.03\)

\(0.21\pm 0.04\)

\(0.25\pm 0.07\)

Variance of blink durations (\(s^{2}\))

\(4.01\hbox {E-}04\pm 3.05\hbox {E-}04\)

\({ 1.13E-03}\pm { 1.06E-03}\)

\({ 2.71E-03}\pm { 2.16E-03}\)

\({ 1.06E-02}\pm { 0.87E-02}\)

Length of scanpath (pixel)

\(6002.49\pm 3994.3\)

\({ 8387.62}\pm { 4824.81}\)

\({ 11109.34}\pm { 6576.00}\)

\({ 16063.95}\pm { 8713.61}\)

Mean of saccade length (pixel)

\(137.11\pm 84.5\)

\({ 209.91}\pm { 110.03}\)

\({ 331.59}\pm { 255.29}\)

\({ 619.30}\pm { 500.48}\)

  1. Values of indicators were shown as mean ± standard deviation (SD).
  2. Compared with 1st measurement, \(\hbox {P}<0.05\) were characterized in italics
  3. Data were recorded during 20 s