The Use of Interactive Binocular Treatment (I-BiT) for the Management of Anisometropic, Strabismic and Mixed Amblyopia in Children Aged 3.5 - 12 Years

Inclusion Criteria: * The child must be aged between 3 years 6 months and 9 years 11 months (upper limit is one day before their 10th birthday on day of consent.) * Visual acuity difference of at least 0.3 log units, with the amblyopic eye being 0.3 logMAR or worse. * Must have undergone a minimum of 12 weeks refractive adaptation. * Those in group one must not have had patching or penalisation at all previously but the other two groups' participants may have had previous occlusion. * Must not have had previous strabismus surgery (for groups one and two, and for group three, they must start the treatment within 4 weeks of having surgery. * Must be able to use the I-BiT plus system. Exclusion Criteria: * Stimulus deprivation amblyopia. * Other ocular or neurological disease affecting the visual system (including Down's syndrome, developmental delay,Craniofacial syndrome,Foetal Alcohol Syndrome, and cerebral palsy among other conditions). * Photosensitive epilepsy. * Parent, guardian or child not prepared to give consent.