Abstract
Amblyopia can be defined as a developmental disorder in which there is a deficit in visual acuity that cannot be improved by refractive correction and that has no detectable organic cause. It has been recognized as a clinical entity for over 300 years. Amblyopia can no longer be considered a single clinical entity, many subtypes having been recognized.1–9 Early detection and treatment may result in positive outcomes in some subtypes, but others, if not detected early, are not responsive to treatment.