The clinical effectiveness of binocular investigation for amblyopia was measured. The authors had previously unsuccessfully treated patients using occlusion and / or surgery. Patients were followed for an average of six months after cessation of treatment. The study included 22 patients with strabismic or anisometropic amblyopia with a mean age of 36.2±20.3 years. They completed an average 14.5 sessions of binocular training over four to six weeks. Random dot kinematograms were presented dichoptically to both eyes. The patient had to identify the direction of motion of targets. Results showed improved visual acuity in all patients and this was maintained after six months. The mean increase in visual acuity was 0.34 logMAR and increased significantly with the number of treatment sessions completed. The age and severity of amblyopia did not predict improved visual acuity. Suppression levels for amblyopia were not reported in this study.