strabismic amblyopia

Reduced best-corrected acuity in the deviating eye of a constant, one-sided strabismus that began in early childhood, with no disease of the eye or visual pathway to explain the loss^1,3. The deviated eye's fovea sees a different object from the fixating fovea (confusion) and its periphery sees the fixated object in the wrong direction (diplopia); the cortex suppresses that eye's image to escape both, and suppression held through the years of visual development becomes a lasting loss of acuity².

An alternating strabismus does not produce it, because each eye takes its turn at fixation. It is expected in constant esotropia far more than in exotropia, which is usually intermittent at onset, and almost never in a hypertropia⁴.