Amblyopia, commonly known as lazy eye, refers to reduced vision in one or both eyes that results from suppression of the retinal image. It is caused by uncorrected refractive errors like nearsightedness, farsightedness, or astigmatism between the eyes (anisometropia); eye misalignment like strabismus; or visual deprivation from conditions that obstruct the visual axis. Symptoms include misaligned eyes, poor depth perception, eye closing or squinting, and eyes not moving together. Treatment involves correcting refractive errors with glasses or contacts, patching or blurring the stronger eye to stimulate the weaker eye, and sometimes surgery to repair eye alignment issues or remove obstructions.