
Figure 1:
Screenshot of the VNG test interface showing the complete set of available ocular and vestibular assessment modules, including saccades, smooth pursuit, caloric test, optokinetic test, spontaneous nystagmus, gaze test, positional test, Subjective Mid-Point, Subjective Visual Vertical, Pupillometry, Head Impulse Test, and Video Frenzal. VNG, videonystagmography.

Figure 2:
Hardware configuration of the Balance Eye VNG system (Cyclops MedTech Pvt. Ltd.), comprising the infrared video goggles for binocular eye tracking and the processing unit for real-time recording and analysis of horizontal and vertical eye movements. VNG, videonystagmography.

Figure 3:
Experimental setup for VNG-based eye-movement recording using the Balance Eye system, illustrating the participant seated in front of the visual stimulus display while wearing infrared video goggles for real-time acquisition of horizontal and vertical saccadic eye movements under controlled laboratory conditions. VNG, videonystagmography.
Table 1:
Reliability analysis of saccadic eye-movement parameters using Cronbach’s alpha.
| N | % | ||
|---|---|---|---|
| Cases | Valid | 36 | 100.0 |
| Excluded | 0 | 0.0 | |
| Total | 36 | 100.0 | |
| Reliability statistics | |||
| Cronbach’s alpha | Cronbach’s alpha based on standardized items | N of Items | |
| 0.738 | 0.846 | 12 | |
Table 2:
Normality assessment of saccadic latency and academic performance scores.
| Tests of normality on saccades latency | Shapiro–Wilk | |||||
|---|---|---|---|---|---|---|
| Kolmogorov–Smirnova | ||||||
| Statistic | df | Sig. | Statistic | df | Sig. | |
| Saccades latency | 0.090 | 36 | 0.200* | 0.974 | 36 | 0.537 |
| Tests of normality on average marks | Shapiro–Wilk | |||||
|---|---|---|---|---|---|---|
| Kolmogorov–Smirnova | ||||||
| Statistic | df | Sig. | Statistic | df | Sig. | |
| Average marks | 0.094 | 36 | 0.200* | 0.980 | 36 | 0.742 |
Table 3:
Pearson correlation matrix of horizontal and vertical saccadic parameters.
| SHRV | SHRP | SHRL | SHLV | SHLP | SHLL | SVRV | SVRP | SVRL | SVLV | SVLP | SVLL | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| SHRV | Pearson correlation | 1 | 0.679** | −0.150 | 0.823** | 0.448** | −0.202 | 0.508** | 0.357* | −0.366* | 0.311 | 0.230 | −0.403* |
| Sig. (two-tailed) | 0.000 | 0.383 | 0.000 | 0.006 | 0.238 | 0.002 | 0.033 | 0.028 | 0.065 | 0.178 | 0.015 | ||
| N | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | |
| SHRP | Pearson correlation | 0.679** | 1 | 0.242 | 0.770** | 0.866** | 0.207 | 0.426** | 0.474** | −0.152 | 0.426** | 0.363* | −0.161 |
| Sig. (two-tailed) | 0.000 | 0.156 | 0.000 | 0.000 | 0.225 | 0.009 | 0.003 | 0.376 | 0.010 | 0.029 | 0.349 | ||
| N | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | |
| SHRL | Pearson correlation | −0.150 | 0.242 | 1 | 0.013 | 0.380* | 0.892** | 0.044 | 0.284 | 0.453** | 0.139 | 0.315 | 0.511** |
| Sig. (two-tailed) | 0.383 | 0.156 | 0.941 | 0.022 | 0.000 | 0.800 | 0.093 | 0.005 | 0.419 | 0.061 | 0.001 | ||
| N | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | |
| SHLV | Pearson correlation | 0.823** | 0.770** | 0.013 | 1 | 0.697** | 0.031 | 0.456** | 0.450** | −0.169 | 0.364* | 0.380* | −0.238 |
| Sig. (two-tailed) | 0.000 | 0.000 | 0.941 | 0.000 | 0.856 | 0.005 | 0.006 | 0.325 | 0.029 | 0.022 | 0.163 | ||
| N | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | |
| SHLP | Pearson correlation | 0.448** | 0.866** | 0.380* | 0.697** | 1 | 0.396* | 0.291 | 0.560** | 0.118 | 0.395* | 0.577** | 0.066 |
| Sig. (two-tailed) | 0.006 | 0.000 | 0.022 | 0.000 | 0.017 | 0.085 | 0.000 | 0.494 | 0.017 | 0.000 | 0.702 | ||
| N | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | |
| SHLL | Pearson correlation | −0.202 | 0.207 | 0.892** | 0.031 | 0.396* | 1 | 0.024 | 0.295 | 0.491** | 0.118 | 0.339* | 0.495** |
| Sig. (two-tailed) | 0.238 | 0.225 | 0.000 | 0.856 | 0.017 | 0.888 | 0.081 | 0.002 | 0.493 | 0.043 | 0.002 | ||
| N | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | |
| SVRV | Pearson correlation | 0.508** | 0.426** | 0.044 | 0.456** | 0.291 | 0.024 | 1 | 0.770** | −0.141 | 0.797** | 0.588** | −0.155 |
| Sig. (two-tailed) | 0.002 | 0.009 | 0.800 | 0.005 | 0.085 | 0.888 | 0.000 | 0.414 | 0.000 | 0.000 | 0.367 | ||
| N | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | |
| SVRP | Pearson correlation | 0.357* | 0.474** | 0.284 | 0.450** | 0.560** | 0.295 | 0.770** | 1 | 0.118 | 0.754** | 0.858** | 0.105 |
| Sig. (two-tailed) | 0.033 | 0.003 | 0.093 | 0.006 | 0.000 | 0.081 | 0.000 | 0.492 | 0.000 | 0.000 | 0.544 | ||
| N | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | |
| SVRL | Pearson correlation | −0.366* | −0.152 | 0.453** | −0.169 | 0.118 | 0.491** | −0.141 | 0.118 | 1 | 0.053 | 0.245 | 0.938** |
| Sig. (two-tailed) | 0.028 | 0.376 | 0.005 | 0.325 | 0.494 | 0.002 | 0.414 | 0.492 | 0.759 | 0.151 | 0.000 | ||
| N | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | |
| SVLV | Pearson correlation | 0.311 | 0.426** | 0.139 | 0.364* | 0.395* | 0.118 | 0.797** | 0.754** | 0.053 | 1 | 0.716** | 0.027 |
| Sig. (two-tailed) | 0.065 | 0.010 | 0.419 | 0.029 | 0.017 | 0.493 | 0.000 | 0.000 | 0.759 | 0.000 | 0.874 | ||
| N | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | |
| SVLP | Pearson correlation | 0.230 | 0.363* | 0.315 | 0.380* | 0.577** | 0.339* | 0.588** | 0.858** | 0.245 | 0.716** | 1 | 0.179 |
| Sig. (two-tailed) | 0.178 | 0.029 | 0.061 | 0.022 | 0.000 | 0.043 | 0.000 | 0.000 | 0.151 | 0.000 | 0.295 | ||
| N | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | |
| SVLL | Pearson correlation | −0.403* | −0.161 | 0.511** | −0.238 | 0.066 | 0.495** | −0.155 | 0.105 | 0.938** | 0.027 | 0.179 | 1 |
| Sig. (two-tailed) | 0.015 | 0.349 | 0.001 | 0.163 | 0.702 | 0.002 | 0.367 | 0.544 | 0.000 | 0.874 | 0.295 | ||
| N | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 |
SHLL, saccade horizontal left eye latency; SHLP, saccade horizontal left eye precision; SHLV, saccade horizontal left eye velocity; SHRL, saccade horizontal right eye latency; SHRP, saccade horizontal right eye precision; SHRV, saccade horizontal right eye velocity; SVLL, saccade vertical left eye latency; SVLP, saccade vertical left eye precision; SVLV, saccade vertical left eye velocity; SVRL, saccade vertical right eye latency; SVRP, saccade vertical right eye precision; SVRV, saccade vertical right eye velocity.
Table 4:
Independent sample t-Test results comparing saccadic eye-movement parameters by gender.
| Levene’s test for equality of variances | t-Test for equality of means | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| F | Sig. | t | df | Sig. (two-tailed) | Mean difference | Std. error difference | 95% confidence interval of the difference | |||
| Lower | Upper | |||||||||
| SHRV | Equal variances assumed | 913.363 | 0.000 | 15.209 | 5337 | 0.000 | 26.00878 | 1.71005 | 22.65639 | 29.36117 |
| Equal variances not assumed | 14.635 | 3,665.988 | 0.000 | 26.00878 | 1.77715 | 22.52448 | 29.49307 | |||
| SHRP | Equal variances assumed | 250.421 | 0.000 | 7.471 | 5,337 | 0.000 | 2.28499 | 0.30586 | 1.68538 | 2.88460 |
| Equal variances not assumed | 7.212 | 3,813.823 | 0.000 | 2.28499 | 0.31685 | 1.66379 | 2.90619 | |||
| SHRL | Equal variances assumed | 45.024 | 0.000 | −18.683 | 5,337 | 0.000 | −17.27987 | 0.92492 | −19.09309 | −15.46666 |
| Equal variances not assumed | −18.514 | 4,979.906 | 0.000 | −17.27987 | 0.93332 | −19.10958 | −15.45016 | |||
| SHLV | Equal variances assumed | 357.325 | 0.000 | 26.236 | 5,337 | 0.000 | 44.13396 | 1.68218 | 40.83620 | 47.43172 |
| Equal variances not assumed | 25.441 | 4,025.262 | 0.000 | 44.13396 | 1.73477 | 40.73285 | 47.53507 | |||
| SHLP | Equal variances assumed | 842.819 | 0.000 | 9.795 | 5,337 | 0.000 | 3.85816 | 0.39388 | 3.08599 | 4.63033 |
| Equal variances not assumed | 9.349 | 3,305.847 | 0.000 | 3.85816 | 0.41269 | 3.04900 | 4.66732 | |||
| SHLL | Equal variances assumed | 270.582 | 0.000 | −6.851 | 5,337 | 0.000 | −7.04183 | 1.02782 | −9.05677 | −5.02688 |
| Equal variances not assumed | −6.744 | 4,718.012 | 0.000 | −7.04183 | 1.04409 | −9.08874 | −4.99491 | |||
| SVRV | Equal variances assumed | 273.269 | 0.000 | −2.671 | 5,337 | 0.008 | −4.91581 | 1.84023 | −8.52342 | −1.30820 |
| Equal variances not assumed | −2.614 | 4,450.120 | 0.009 | −4.91581 | 1.88068 | −8.60288 | −1.22874 | |||
| SVRP | Equal variances assumed | 416.645 | 0.000 | −0.751 | 5,337 | 0.453 | −0.27302 | 0.36367 | −0.98596 | 0.43991 |
| Equal variances not assumed | −0.724 | 3,756.542 | 0.469 | −0.27302 | 0.37719 | −1.01255 | 0.46650 | |||
| SVRL | Equal variances assumed | 6.181 | 0.013 | 8.238 | 5,337 | 0.000 | 10.49969 | 1.27453 | 8.00109 | 12.99829 |
| Equal variances not assumed | 8.205 | 5,138.282 | 0.000 | 10.49969 | 1.27973 | 7.99088 | 13.00850 | |||
| SVLV | Equal variances assumed | 18.519 | 0.000 | −8.608 | 5,337 | 0.000 | −14.37928 | 1.67038 | −17.65391 | −11.10466 |
| Equal variances not assumed | −8.651 | 5,313.766 | 0.000 | −14.37928 | 1.66219 | −17.63785 | −11.12072 | |||
| SVLP | Equal variances assumed | 223.709 | 0.000 | 7.777 | 5,337 | 0.000 | 3.61782 | 0.46521 | 2.70581 | 4.52983 |
| Equal variances not assumed | 7.581 | 4,277.298 | 0.000 | 3.61782 | 0.47720 | 2.68225 | 4.55339 | |||
| SVLL | Equal variances assumed | 33.708 | 0.000 | −2.404 | 5,337 | 0.016 | −3.22244 | 1.34057 | −5.85049 | −0.59438 |
| Equal variances not assumed | −2.409 | 5,279.145 | 0.016 | −3.22244 | 1.33751 | −5.84452 | −0.60035 | |||
[i] SHLL, saccade horizontal left eye latency; SHLP, saccade horizontal left eye precision; SHLV, saccade horizontal left eye velocity; SHRL, saccade horizontal right eye latency; SHRP, saccade horizontal right eye precision; SHRV, saccade horizontal right eye velocity; SVLL, saccade vertical left eye latency; SVLP, saccade vertical left eye precision; SVLV, saccade vertical left eye velocity; SVRL, saccade vertical right eye latency; SVRP, saccade vertical right eye precision; SVRV, saccade vertical right eye velocity.

Figure 4:
Time-domain representation of horizontal saccadic eye movements for both the right and left eyes, showing the relative positions of the visual target (green trace), right eye foveal position (red trace), and left eye foveal position (blue trace), highlighting saccadic latency and accuracy during target shifts.
Table 5:
Linear regression analysis of saccadic latency measures as predictors of academic performance.
| Saccade parameter | α | β | R | R2 | F | P | Indicator |
|---|---|---|---|---|---|---|---|
| Horizontal saccade latency (R) | −0.101 | 44.510 | 0.334 | 0.112 | 4.268 | 0.047 | Significant |
| Horizontal saccade latency (L) | −0.071 | 40.604 | 0.245 | 0.06 | 2.175 | 0.149 | Insignificant |
| Vertical saccade latency (R) | −0.117 | 46.169 | 0.506 | 0.256 | 11.696 | 0.002 | Significant |
| Vertical saccade latency (L) | −0.106 | 45.358 | 0.496 | 0.246 | 11.089 | 0.002 | Significant |