What are the causes of amblyopia or lazy eye?

What are the causes of amblyopia or lazy eye?

La amblyopia or lazy eye occurs when one eye has reduced visual acuity (manifested as blurred vision) and the other eye sees normal, but the brain only processes the vision of this eye, also called dominant. 

Anything that obstructs vision in either eye during a child's development has the potential to cause lazy eye. Although the reasons are not clear, the brain suppresses the images coming from the most affected eye.

Below are examples of some possible causes.

Examples of causes of amblyopia or lazy eye


This is an imbalance in the muscles that position the eye that causes the eyes to cross or turn outward. The muscle imbalance makes it difficult for both eyes to follow objects at the same time. He squint it can be inherited or result from nearsightedness, a viral disease, or injury.

Anisometropic amblyopia

It is a refractive error; It occurs when light is not focused correctly and moves through the lens of the eye. Refractive errors occur due to nearsightedness, farsightedness, or astigmatism, in which the surface of the cornea or lens is uneven, causing blurred vision.

A child with anisometropic amblyopia will be more farsighted or nearsighted in one eye than the other, triggering amblyopia to develop in the more affected eye.

Stimulus deprivation amblyopia

This is the least common form of amblyopia. One eye cannot see and becomes weak. Sometimes both can be affected.

This may be due to:

  • A corneal ulcer, scar, or other eye disease.
  • A congenital cataract, in which a baby is born with a cloudy lens
  • Fallen eyelid
  • Injury to the eye due to external causes
  • eye surgery

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