## 4 Discussion
In addition, considerable variability in CoP velocity (VarV) was observed, which may indicate postural rigidity or the presence of excessive compensatory mechanisms in some athletes, potentially linked to elevated soleus muscle activity. These findings align with previous studies reporting similar patterns of balance control efficiency and compensatory strategies in athletic populations [36; 37]. Recent evidence indicates that visual input predominantly affects postural control at low frequencies (0.125-0.5 Hz), whereas proprioceptive and vestibular systems contribute more substantially at higher frequencies [38; 39]. The present findings regarding normalized amplitude at 0.2 Hz support the idea that vision contributes significantly to postural adjustments in football players. The analysis of load distribution revealed a balanced plantar pressure, with a slight predominance in the forefoot compared with the rearfoot, a pattern typically observed in sports requiring dynamic and rapid movements. A greater load was observed on the left rearfoot compared with the right, while the forefoot showed a slightly more even distribution. Additionally, there was a tendency for weight to shift forward, a slight preference for anterior weight shift, and a slight preference for loading on the left side, potentially reflecting sport-specific postural adaptations aimed at optimizing performance during gameplay. These results are consistent with findings from a previous study, which suggest that forefoot loading patterns are common in dynamic sports that require rapid accelerations and changes in direction [40]. Moreover, recent research indicates that such adaptations may be linked to the heightened demand for postural stability required in football, where maintaining balance while executing complex motor actions is essential [41]. The role of vision in postural stability is particularly relevant in high-demand sports environments, such as football, where rapid changes in direction and spatial awareness are essential. The visual system provides crucial information for body positioning and balance adjustments, allowing athletes to anticipate movements and react to external stimuli efficiently. Several studies, including [PERSON] et al. (2020), have demonstrated that uncorrected refractive errors, including myopia and astigmatism, may compromise postural stability by altering spatial perception and increasing postural sway [8]. Additionally, athletes with visual impairments often rely more on proprioceptive and vestibular inputs, which can lead to increased compensatory mechanisms and greater instability, particularly under visually challenging conditions [42]. The analysis of postural asymmetry revealed a slight tendency toward lateralization, albeit minimal, while foot coordination approached the lower limit of normality. Thesefindings suggest potential areas for improvement in intersegmental stability (Coordination between body segments (feet, legs, trunk) to maintain balance), which could enhance balance and postural stability in elite athletes. The influence of vision on postural stability was evidenced by the Romberg quotients, highlighting the critical role of vision in maintaining balance. The QRBG(Surf), which quantifies postural sway area by comparing eyes-open and eyes-closed conditions, reflects greater visual dependence when elevated values are observed, indicating reduced efficiency of the proprioceptive and vestibular systems in the absence of vision. Similarly, the QRBVV, which measures the velocity variance of postural sway, indicates that dynamic postural control relies more heavily on vision under similar conditions. These findings underscore the critical integration of vision with other sensory systems to maintain postural stability, particularly in more complex motor situations. Football requires not only static but also dynamic balance, as players frequently change posture during motion, requiring rapid adjustments based on visual cues.