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Lazy eye (amblyopia) – Symptoms & causes – Mayo Clinic


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eye ( amblyopia ) is reduced vision in one eye caused by abnormal visual development early in life. The weaker — or lazy — eye often wanders inward or outward .Amblyopia generally develops from birth up phệ age 7 years. It is the leading cause of decreased vision among children. Rarely, lazy eye affects both eyes .Early diagnosis và treatment can help prevent long-term problems with your child’s vision. The eye with poorer vision can usually be corrected with glasses or liên hệ lenses, or patching therapy .


Signs và symptoms of lazy eye include :

  • An eye that wanders inward or outward
  • Eyes that appear to not work together
  • Poor depth perception
  • Squinting or shutting an eye
  • Head tilting
  • Abnormal results of vision screening tests

Sometimes lazy eye is not evident without an eye exam .

When to see a doctor

See your child’s bác sĩ if you notice his or her eye wandering after the first few weeks of life. A vision kiểm tra is especially important if there’s a family history of crossed eyes, childhood cataracts or other eye conditions .For all children, a complete eye exam is recommended between ages tam và 5 .


Lazy eye develops because of abnormal visual experience early in life that changes the nerve pathways between a thin layer of tissue ( retina ) at the back of the eye & the brain. The weaker eye receives fewer visual signals. Eventually, the eyes ‘ ability Khủng work together decreases, và the brain suppresses or ignores input đầu vào from the weaker eye .Anything that blurs a child’s vision or causes the eyes lớn cross or turn out can result in lazy eye. Common causes of the condition include :

  • Muscle imbalance (strabismus amblyopia). The most common cause of lazy eye is an imbalance in the muscles that position the eyes. This imbalance can cause the eyes to cross in or turn out, and prevents them from working together.
  • Difference in sharpness of vision between the eyes (refractive amblyopia). A significant difference between the prescriptions in each eye — often due to farsightedness but sometimes to nearsightedness or an uneven surface curve of the eye (astigmatism) — can result in lazy eye.

    Glasses or liên hệ lenses are typically used phệ correct these refractive problems. In some children lazy eye is caused by a combination of strabismus và refractive problems.

  • Deprivation. A problem with one eye — such as a cloudy area in the lens (cataract) — can prohibit clear vision in that eye. Deprivation amblyopia in infancy requires urgent treatment to prevent permanent vision loss. It’s often the most severe type of amblyopia.

Risk factors

Factors associated with an increased risk of lazy eye include :

  • Premature birth
  • Small size at birth
  • Family history of lazy eye
  • Developmental disabilities


Untreated, lazy eye can cause permanent vision loss .

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