Vision therapy encompasses a wide range of optometric treatment modalities, with the therapeutic goal of correcting or improving specific dysfunctions of the vision system. The focus of orthoptics is the evaluation and treatment of disorders of vision, eye movements and eye alignment in children and adults. The amount of daily occlusion and overall duration of treatment depends on several factors including the age of the child and level of vision at presentation and compliance. Each patient must be evaluated individually, however, and the leading practitioner must decide the necessity of orthoptic evaluation based on presentation, severity of trauma, and complaints during the treatment process to avoid excessive examination. In most situations, the exact details of treatment are usually left to the discretion of the orthoptist.