Normal visual development requires unimpeded and coordinated input from each eye to the visual cortex during an early critical period of cortical maturation. Disrupted binocular vision during this critical period, due to visual deprivation (e.g. congenital cataract), misalignment of the eyes (strabismus) or unequal refractive error (anisometropia), can lead to amblyopia, a neurodevelopmental disorder of vision (Daw, 2014; Holmes & Clarke, 2006). Amblyopia is characterized by a loss of visual acuity in the affected eye and impaired or absent binocular visual function in the absence of any ocular disease or abnormality.