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Crossed eyes is a condition in which the eyes don’t line up with each other, and don’t look in the same direction. The term doctors use for this is “strabismus.” In some places, people use the word “squint” to describe crossed eyes.

Lazy eye is a condition in which 1 eye doesn’t see as well as the other eye. The term doctors use for this is “amblyopia.”

Strabismus and amblyopia are usually found in childhood. In many cases, a child has both conditions. This is because if the eyes are crossed a lot of the time, it can cause one eye to become lazy. But some children with crossed eyes don’t get lazy eye.

If your child has crossed eyes or lazy eye, it’s important to get treatment as early as possible. If these conditions aren’t treated early, there can be lifelong vision and eye problems.

What causes these conditions?

Different things can cause these conditions:

Crossed eyes is caused by a problem with the muscles that make the eyes move. Different conditions can cause problems with the eye muscles. Crossed eyes can run in families.

Lazy eye is most commonly caused by crossed eyes. That’s because when someone has crossed eyes, each eye sees and sends a different image to the brain. This is confusing for the brain, so the brain ignores the images from 1 eye. Over time, the ignored eye becomes weaker and doesn’t see as well.

The other main cause of lazy eye is when 1 eye focuses better than the other. Usually, the problem is that 1 eye is farsighted, meaning it has trouble focusing on things that are close, and the other is not. This causes the same type of confusion for the brain as when a person has crossed eyes. The brain ignores the images from the eye that doesn’t focus as well, and over time, the ignored eye becomes weaker.

Other eye problems like cataract can also cause lazy eye. But these are uncommon in children.