Causes of Squint

Strabismus can be:

  • congenital, meaning a person is born with it
  • hereditary, or running in families, suggesting a genetic link
  • the result of an illness or long-sightedness
  • due to a lesion on a cranial nerve

If the eye cannot focus the light as it comes in through the lens, this is known as a refractive error.

Other problems that can lead to strabismus include:

  • myopia, or short-sightedness
  • hypermetropia, or long-sightedness
  • astigmatism, where the cornea is not curved properly

A refractive error tends to make the affected eye turn inward, in an attempt to get better focus.

Strabismus that results from refractive errors tends to emerge later on, usually around the age of 2 years or older.

Hydrocephalus can also lead to strabismus. Hydrocephalus is a condition in which too much cerebrospinal fluid builds up in and around the brain.

Some viral infections, such as measles, can cause strabismus. Other conditions that can cause it include Noonan Syndrome and some other genetic conditions.