HOW COMMON IS IT?
Incidence is 3 - 4 % of the population
HOW DO THE EYES WORK TOGETHER
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