APA Dictionary of Psychology

a condition affecting central vision in which the early development of neural circuits for fine-pattern discrimination is disrupted due to inadequate detail in foveal imagery. There are two forms of developmental amblyopia: anisometropic amblyopia, in which the two eyes have differing powers of refraction, and strabismic amblyopia, in which the image from one eye is favored because of imbalance in the extrinsic eye muscles.