Q1: What is a lazy eye? Q2: How does a lazy eye affect vision? Q3: How common is lazy eye? Q4: What causes a lazy eye? Q5: Who is at risk of developing a lazy eye? Premature birth Small birth weight Family history of lazy eye Developmental delays Q6: Which vision conditions can cause a lazy eye? A: Lazy eye can develop from a few different vision conditions: Refractive amblyopia is the most common form of amblyopia.
It can be divided into two types: Isometropia is a significantly high, but equal optical prescription in both eyes. Anisometropia is a significant difference in eyeglass prescription i. Constant strabismus is a constant noticeable turn of one eye in any direction.
An inward turn of the eye esotropia is the most common. Amblyopia resulting from strabismus can be easier to detect because the noticeable eye turn alerts to a vision problem. Ocular obstruction can result from any physical blockage of vision, such as a cataract , trauma, lid droop ptosis , or blocked tear duct.
Congenital disorders and vitamin A deficiency are less common causes of lazy eye. View the changes to our visitor policy ». View information for Guest Services ». Access your health information from any device with MyHealth. You can message your clinic, view lab results, schedule an appointment, and pay your bill. Any condition that prevents your child's eyes from forming a clear, focused image or that prevents the normal use of one or both eyes can cause amblyopia.
It may happen when:. Your child may be more likely to have amblyopia if someone else in your family had it or if your child had a premature birth or low birth weight. Share on Facebook. Notice: Users may be experiencing issues with displaying some pages on stanfordhealthcare. We are working closely with our technical teams to resolve the issue as quickly as possible.
Thank you for your patience. The weaker eye receives fewer visual signals. Eventually, the eyes' ability to work together decreases, and the brain suppresses or ignores input from the weaker eye. Anything that blurs a child's vision or causes the eyes to cross or turn out can result in lazy eye.
Common causes of the condition include:. 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 contact lenses are typically used to correct these refractive problems.
In some children lazy eye is caused by a combination of strabismus and refractive problems. Mayo Clinic does not endorse companies or products. The brain starts to ignore the poor-quality images, resulting in a "lazy eye". For most children this happens because of a problem with the image in one eye. As a result, the brain becomes increasingly reliant on the stronger eye, which makes the weaker eye even lazier. A squint is a common eye condition that affects around 1 in 20 children.
If a child has a squint, one eye looks straight ahead but the other eye looks off to the left, right, up or down. This causes the brain to receive two very different images that it cannot combine.
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