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Intraocular
Pressure
(IOP)
 The
intraocular
pressure,
an
important
part
of
any
eye
exam,
is
measured
with
a
special
instrument
called
a tonometer.
The
IOP
is
determined
by
a
balance
of
the
eye’s
production
and
drainage
of
aqueous
(the
clear
fluid
inside
the
eye)
from
the
anterior
chamber
into
the
trabecular
meshwork.
If
the
IOP
is
elevated,
it
can
cause
pressure
within
the
eye
to
increase
and
damage
the
optic
nerve.
Since
abnormal
pressures
usually
don’t
cause
symptoms,
it’s
very
important
to
have
the
pressure
checked
regularly.
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