Common Vision Problems for Tohono O'odham Children
What kind of vision problems do Tohono Oodham children have? Many
Tohono Oodham children, and children of other Native American tribes,
have an eye condition called astigmatism. Approximately one in every three
Tohono Oodham children (33%) requires glasses for astigmatism, and
children with astigmatism usually have astigmatism in both eyes. We do
not know why so many Tohono Oodham children have astigmatism. However,
we do know that if children do not get glasses for astigmatism when they
are young (before age 8), they can develop a condition called amblyopia.
What is astigmatism?
Astigmatism is a condition in which the front of the eye (the cornea)
is more steeply curved in one direction than another. Instead of the front
surface of the eye being round and equally curved in all directions like
a basketball, it is shaped more like a football or an egg: it is curved
more in one direction than in the other direction.
People with astigmatism do not see clearly at any distance up
close or far away when they are not wearing eyeglasses. Because
of the shape of the front of the eye, their eyes can not bring images
into focus. If children with astigmatism do not wear glasses when they
are young, they can develop a condition called amblyopia.
Amblyopia is poor vision that cannot be corrected with eyeglasses.
People with amblyopia do not have perfect vision, even when they are wearing
their eyeglasses. For the visual part of the brain to develop correctly,
young children need to see clearly: The eye needs to be able to bring
images of what the child is looking at into focus. If the images are not
focused clearly, the visual part of the brain does not develop the way
it should. Children with astigmatism who do not wear
glasses while their vision is still developing can develop amblyopia.
What can we do to assure that the children
do not develop amblyopia? The treatment for
amblyopia is wearing glasses. If children with astigmatism get eyeglasses
when they are young, and wear them, there is a good chance that they will
not develop amblyopia. For older children who did not have glasses when
they were young, it is possible that they have developed amblyopia and
that the glasses will not help them gain perfect vision. However, even
these older children should see better with their glasses on than with
their glasses off.
Sometimes it is difficult to get children to wear glasses. Getting used
to glasses that correct astigmatism can take a week or two. However, we
have found that if parents and teachers work together to encourage the
children to wear their glasses, the children will eventually become used
to wearing them.
Once a child has been prescribed eyeglasses, he or she should receive
regular eye examinations every 12 months. The eye doctor can make sure
that the childs prescription is still correct, and can check to
see if the childs eyeglasses are in need of repair or replacement.