## 3 Results
### Analysis of Correlations Between Visual Parameters and Postural Stability  
Visual acuity, assessed both monocularly and binocularly, demonstrated significant correlations with key postural stability parameters, including DistMean, Surface, and Length (Table 3). For DistMean, negative correlations were observed (r = \(-\)0.318, \(p\) = 0.033 for monocular acuity; r = \(-\)0.352, \(p\) = 0.020 for binocular acuity), indicating that better \begin{table}
\begin{tabular}{c c c} \hline \hline  & & **Mean \(\pm\) SD** \\ \hline \multirow{3}{*}{Mean CoP position} & Xmean (mm) & \(-\)1.18 \(\pm\) 10.09 \\ \cline{2-3}  & Ymean (mm) & 43.42 \(\pm\) 19.67 \\ \cline{2-3}  & DistMean (mm) & 6.74 \(\pm\) 2.13 \\ \hline \multirow{3}{*}{Area and amplitude of sway} & Surface (mm\({}^{2}\)) & 300.55 \(\pm\) 157.07 \\ \cline{2-3}  & Length (mm) & 889.10 \(\pm\) 270.52 \\ \cline{2-3}  & LengthX (mm) & 729.77 \(\pm\) 262.81 \\ \cline{2-3}  & LengthY (mm) & 377.95 \(\pm\) 93.63 \\ \hline \multirow{3}{*}{Velocity and variability of CoP} & VarV (mm\({}^{2}\)/s\({}^{2}\)) & 115.24 \(\pm\) 56.46 \\ \cline{2-3}  & VFY (mm/s) & \(-\)5.00 \(\pm\) 10.00 \\ \hline \multirow{3}{*}{Frequency and spectral analysis} & AN02X (\%) & 27.35 \(\pm\) 9.89 \\ \cline{2-3}  & AN02Y (\%) & 27.63 \(\pm\) 8.19 \\ \hline \multirow{3}{*}{Load distribution and asymmetry} & LF (\%) & 0.28 \(\pm\) 0.07 \\ \cline{2-3}  & LR (\%) & 0.24 \(\pm\) 0.09 \\ \cline{2-3}  & RF (\%) & 0.30 \(\pm\) 0.07 \\ \cline{2-3}  & RR (\%) & 0.18 \(\pm\) 0.07 \\ \cline{2-3}  & LFOOT (\%) & 0.51 \(\pm\) 0.05 \\ \cline{2-3}  & RFOOT (\%) & 0.48 \(\pm\) 0.05 \\ \cline{2-3}  & Posterior (\%) & 0.42 \(\pm\) 0.13 \\ \cline{2-3}  & Anterior (\%) & 0.58 \(\pm\) 0.13 \\ \cline{2-3}  & APR (\%) & \(-\)16.50 \(\pm\) 25.19 \\ \cline{2-3}  & LRR (\%) & 3.07 \(\pm\) 9.53 \\ \cline{2-3}  & FeetP (\({}^{\circ}\)) & 4.20 \(\pm\) 6.5 \\ \cline{2-3}  & IntCorLR & 0.76 \(\pm\) 0.15 \\ \hline \multirow{3}{*}{Stability and postural stability} & LFS & 1.75 \(\pm\) 0.50 \\ \cline{2-3}  & IVV (PA) & \(-\)0.01 \(\pm\) 0.16 \\ \hline \multirow{3}{*}{Dependence vision} & QRBG(Surf) (\%) & 125.00 \(\pm\) 97.80 \\ \cline{2-3}  & QRBVV (\%) & 122.36 \(\pm\) 43.83 \\ \cline{1-1} \cline{2-3}  & IntCorLR & 0.76 \(\pm\) 0.15 \\ \hline \multirow{3}{*}{Stability and postural stability} & LFS & 1.75 \(\pm\) 0.50 \\ \cline{2-3}  & IVV (PA) & \(-\)0.01 \(\pm\) 0.16 \\ \hline \multirow{3}{*}{Dependence vision} & QRBG(Surf) (\%) & 125.00 \(\pm\) 97.80 \\ \cline{2-3}  & QRBVV (\%) & 122.36 \(\pm\) 43.83 \\ \hline \end{tabular}  
* CoP: center of pressure; Xmean: medial-lateral deviation in the frontal plane; Ymean: antero-posterior deviation in the sagittal plane; DistMean: distance of the CoP from the central point; Surface: area covered by the ellipse representing 90% of the CoP distribution; Length: total sway amplitude; LengthX: medial-lateral sway amplitude with frontal plane; LengthY: antero-posterior sway amplitude in sagittal plane; VarV: velocity variability; VFV: velocity in function of sagittal plane; AN02X: frontal oscillation at 0.2 Hz frequency; AN02X: sagittal oscillation at 0.2 Hz frequency; LF: load on the left forefoot; LR: load on the left reaffoot; RF: load on the right forefoot; RR: load on the right reaffoot; LFOOT: load on the left foot; RFOOT: load on the right foot; APR: antero-posterior load ratio; LRR: left-right load ratio; FeetP: feet position inclination; IntCorLR: coordination between the feet; LFS: postural stability index; IVV (PA): vertical variability index or postural asymmetry; QRBG(Surf): Romberg quotients for surface area; QRBVV: velocity variance.  
\end{table} 
Table 2: Summary of mean values and standard deviations for postural system parameters. visual acuity is associated with reduced center of pressure (CoP) sway. Similarly, for Surface, negative correlations were found (r = \(-\)0.326, \(p\) = 0.030 and r = \(-\)0.367, \(p\) = 0.016 for monocular and binocular acuity, respectively), suggesting that improved acuity enhances overall postural stability.