Amblyopia (Lazy Eye): Symptoms & Signs

Medically Reviewed on 9/10/2019

Amblyopia refers to partial or complete loss of vision in one eye. It is sometimes referred to as "lazy eye." Amblyopia begins during infancy or very early childhood and is caused by disorders that affect development of the eyes. One common cause is strabismus, in which the failure of the two eyes to work together. Another cause is when a vision defect (like nearsightedness, farsightedness, or astigmatism) occurs in one eye but not in the other.

Signs and symptoms associated with amblyopia include crossed eyes or eyes that appear to wander, poor depth perception, squinting of one eye, and tilting of the head. An abnormal result will occur on a vision screening test, with a defect that may be observed in one eye only.

Other amblyopia (lazy eye) symptoms and signs

  • Abnormal Vision Screening Test
  • Blurry Vision
  • Double Vision
  • Eye Misalignment
  • Head Tilting
  • Poor Depth Perception
  • Squinting


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Kasper, D.L., et al., eds. Harrison's Principles of Internal Medicine, 19th Ed. United States: McGraw-Hill Education, 2015.