the two eyes move parallel to each other in all the directions of
Squint is a misalignment of the two eyes so that both eyes are not looking
in the same direction. In other words the two eyes dont look
straight in the primary gaze. It is a common condition among children.
It may also occur in adults.
At birth the eyes dont move together. One eye moves differently
from the other till the first few months. After that the baby starts
fixing the eyes on the light which is called light fixation and
the eyes start moving together.
Under normal circumstances, when both the eyes have good vision and they
are aligned properly, they focus on the same object. Each of the
eyes sends picture of the same object, viewed from a slightly different
angle. These two images reach the brain, where they are fused to
form a single three-dimensional picture with depth perception. This
is known as binocular single vision.
Six muscles control the movement of each eye. Each of these muscle acts
along with its counterpart in the other eye to keep both eyes aligned
properly. A loss of coordination between the muscles of the two
eyes leads to misalignment. This misalignment may be the same in
all directions of gaze, or in some conditions the misalignment may
be more in one direction of gaze.
Squint may be
Means one of
the muscle attached to the eyes is paralyzed and the eye affected
may turn in/out/up/down depending on the muscle involved i.e. the
eye movement is restricted in the direction of the action of the
paralyzed muscle. This can be caused by direct trauma to the muscle
as for e.g. injury during forceps delivery or any other injury.
It may also be caused by certain nerve palsies, which in turn may
be caused by peripheral neuritis or diseases of the CNS, e.g. meningitis,
encephalitis etc. Treatment of paralytic squint depends on the cause
and many a time paralytic squint may not be completely cured. In
such cases spectacles with prisms are prescribed.
Non Paralytic Squint:
A loss of coordination between
the muscles of the two eyes leads to
misalignment. This misalignment may be the same in all direction
of gaze, or in some conditions the misalignment may be more in one
direction of gaze.
The squint is diagnosed by the ophthalmologist. He or she would do a
few special tests (Cover Uncover Tests) to confirm the squint,
to try and find out the cause and to quantify the amount of derivation.
In some cases there may be a false appearance of squint due to broad
nasal bridge in a child. An ophthalmologist will be able to differentiate
between a true squint and false squint.
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Last updated on 14-05-2001