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What Causes Strabismus?
Some people are born with eyes that do not align in the usual way. This is
called congenital strabismus. In many children, there is no clear cause of
strabismus. In some cases, it is a result of a problem with the nervous system,
especially the part that controls the muscles of the eyes. If it is not
corrected, strabismus can continue into the adult years. Most adults who have
strabismus were born with it.
If strabismus does not appear until later in life, it will cause double
vision. If the eyes become misaligned in an adult who did not have strabismus as
a child, it could be a sign of a serious condition such as a stroke. A sudden,
misalignment of the eyes or double vision are important reasons to see a doctor
immediately.
Someone who is born with strabismus will see without having double vision.
There might be other effects on vision, however. Because the two eyes are not
working well together, depth perception and peripheral vision (vision off to the
side) will not be very good. Eyestrain and headaches can occur frequently. It
might also be necessary to turn the head in unusual ways in order to see in
certain directions.