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NARRATOR: The name "Perkins" carved in stone.
Below a gothic tower, a boy navigates with a cane.
CVI is a brain-based visual impairment--
it's also called cerebral visual impairment,
you'll hear it called both--
and it's the processing of the visual information
that is not happening for children.
And vision is processed
in, like, 30 different parts of your brain,
and some do... some do movement, some do color, some do form,
and certain areas are not working for children.
So we're really looking at how the vision is process,
how the child understands the visual parts of the world.
CVI is really the leading cause of visual impairment
in the United States
and I believe in western Europe as well.
Just with the improved medical science,
the children are born earlier and survive,
sometimes at 24 weeks,
and that can also bring some problems with brain bleeding
or problems with the eye.
NARRATOR: In a photograph,
an infant delivered at 26 weeks is shown in an incubator.
The infant is attached to a ventilator.
MAZEL: 90% of what a child knows
comes through the information that they're getting
through their eyes,
so extremely important for all levels of learning.
NARRATOR: Fade to black.