Vergence disorders are common binocular vision conditions that can cause symptoms such as eyestrain, blurred vision, headaches, and difficulty maintaining clear vision during near tasks. These symptoms are particularly frequent in situations involving sustained near visual demand, such as prolonged use of digital devices, which is increasingly common in daily life. Optometric vision therapy is considered the reference treatment for vergence disorders. However, not all individuals respond in the same way, and some continue to experience symptoms despite appropriate treatment. For this reason, adjunct therapeutic approaches are being explored to improve clinical outcomes. The purpose of this study is to evaluate whether osteopathic manual therapy, when used as an adjunct to optometric vision therapy, provides additional benefits compared with vision therapy alone or vision therapy combined with a sham osteopathic intervention. This randomized, controlled, double-blind clinical trial will compare three parallel groups and will assess changes in vergence function, oculomotor performance measured by video-oculography, and symptom improvement related to vergence disorders.
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Change in vergence reaction latency measured by video-oculography (REMOBI and EyeSeeCam)
Timeframe: Baseline (pre-intervention); post-intervention (within 2 weeks after the last visual therapy session); 3 months after post-intervention assessment; 6 months after post-intervention assessment.
Change in vergence amplitude variability measured by video-oculography (REMOBI and EyeSeeCam)
Timeframe: Baseline (pre-intervention); post-intervention (within 2 weeks after the last visual therapy session); 3 months after post-intervention assessment; 6 months after post-intervention assessment.
Change in vergence amplitude error measured by video-oculography (REMOBI and EyeSeeCam)
Timeframe: Baseline (pre-intervention); post-intervention (within 2 weeks after the last visual therapy session); 3 months after post-intervention assessment; 6 months after post-intervention assessment.
Change in vergence neglect rate measured by video-oculography (REMOBI and EyeSeeCam)
Timeframe: Baseline (pre-intervention); post-intervention (within 2 weeks after the last visual therapy session); 3 months after post-intervention assessment; 6 months after post-intervention assessment.