Types of Squint Causes of Squint Adult Strabismus Childhood Strabismus Non-Surgical Management of Squint Surgery for Strabismus Surgical Management of Squint 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.