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FAQ

Squint FAQs



WHAT IS STRABISMUS?

Strabismus, commonly known as squint, is when the eyes are misaligned and point in different directions. One eye may look straight ahead, while the other eye may turn inward, outward, upward or downward. The misalignment may be aconstant feature, or intermittent.Strabismus is more common in children and occurs equally in males and females. It may also run in families.

HOW COMMON IS IT?
Incidence is 3 - 4 % of the population
 
HOW DO THE EYES WORK TOGETHER
NORMALLY?
With normal vision, both eyes aim at the same spot. The brain then fuses the two pictures into a single
three-dimensional image. This three-dimensional image gives us depth perception.
When one eye turns, the brain receives two different pictures, which do not exactly overlap. In a young child,
the brain learns to ignore the image of the misaligned eye and sees only the image from the straight or better eye.
However, the child is likely to lose depth perception.Adults who develop strabismus often have double vision
because the brain is already trained to receive images from both eyes and cannot ignore the image from the turned eye.
 
WHAT CAUSES STRABISMUS?
The exact cause of strabismus is not fully understood.Six eye muscles, controlling the eye position and movement,
are attached to the outside of each eye. In each eye, twomuscles function to move the eye right or left. The other
four muscles move it up or down or at an angle
 

Six Extra ocular muscles attached to the eyeball that move the eyes
To line up and focus both eyes on a single target, all the muscles in each eye must be balanced and working
together. If this alignment cannot be maintained for some reason it results in outward/inward/upward or downward
drifting of the eye ball. In most cases the cause cannot be determined and remains unexplained
The brain controls the eye muscles. Strabismus is especially common among children with disorders that
affect the brain such as:
Cerebral palsy,
Down syndrome,
Hydrocephalus, and
Brain tumors.
Six Extra ocular muscles attached to the eyeball that move the eyes A cataract or eye injury that affects the vision can also cause strabismus.

WHAT IS AMBLYOPIA?
A common vision problem in children is amblyopia, or "lazy eye." It is so common that it is the reason for more
vision loss in children than all other causes put together.Amblyopia is a decrease in the child's vision that can happen
even when there is no problem with the structure of the eye. The decrease in vision results when one or both eyes
send a blurry image to the brain. The brain then "learns" to only see blurry with that eye, even when glasses are used.
Only children can get amblyopia. If it is not treated, it can cause permanent loss of vision.

WHAT KINDS OF AMBLYOPIA ARE THERE?
There are several different types and causes of amblyopia: Strabismic amblyopia, deprivation amblyopia, and refractive
amblyopia. The end result of all forms of amblyopia is reduced vision in the affected eye(s).
 
WHAT IS STRABISMIC AMBLYOPIA?
Strabismic amblyopia develops when the eyes are not straight. One eye may turn in, out, up or down. When
this happens, the brain "turns off" the eye that is not straight and the vision subsequently dropsin that eye.


WHAT IS DEPRIVATION AMBLYOPIA?
Deprivation amblyopia develops when cataracts, corneal opacities, ptosis or similar conditions "deprive" young
children's eyes of visual experience. If not treated very early, these children can have very poor vision. Sometimes this
kind of amblyopia can affect both eyes
 
WHAT ARE THE SYMPTOMS OF STRABISMUS?

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