Webster's New World Medical Dictionary

intraobserver variation
The amount of varia-
tion one observer experiences when observing the
same material more than once.
intraocular
In the eye. For example, intraocular
pressure is the pressure within the eye.
intraocular lens
An artificial lens made of plas-
tic, silicone, acrylic or other material that is
implanted in the eye during cataract surgery.
Abbreviated IOL.
intraocular pressure
The pressure created by
the continual renewal of fluids within the eye.
Intraocular pressure is increased in glaucoma. In
acute angle-closure glaucoma, intraocular pressure
rises because the canal into which the fluid in the
front part of the eye normally drains is suddenly
blocked. In chronic glaucoma, there is a gradual
imbalance between the production and removal
(resorption) of the fluid in the back part of the eye,
causing the supply of fluid to exceed demand. See
also 
glaucoma.
intraoperative
During surgery.
intraoperative blood salvage
The recovery of
blood lost into a body cavity during surgery or
because of trauma. The blood is recovered in a ster-
ile fashion and stored in a collection bag. This
blood can then be reintroduced into the patient’s
circulation by an intravenous infusion, reducing the
need for donor blood transfusion.
intraoperative radiation therapy
Radiation
treatment given during surgery. Abbreviated IORT.
See also 
radiation therapy.
intraperitoneal
Within the peritoneal cavity, the
area that contains the abdominal organs.
intraperitoneal chemotherapy
Treatment in
which anticancer drugs are put directly into the
abdomen through a thin tube. See also 
chemo-
therapy.
intrastromal corneal ring
A plastic ring that is
designed to be implanted in the cornea, the trans-
parent structure at the front of the eye, to flatten the
cornea and thereby reduce the degree of nearsight-
edness (myopia). The ring is placed in the corneal
stroma, the middle of the five layers of the cornea.