Part Number: PIB01012
Page 17 of 18
Revision A
Revision Date: June 2016
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GLOSSARY OF TECHNICAL TERMS
Term
Definition
Adnexa
Tissues surrounding the eyeball.
Ametropia
Abnormal vision requiring correction for proper focus.
Anterior chamber
Fluid-filled portion of the eye between the iris and
innermost corneal surface.
Aphakic
An eye that does not have its natural lens (example:
after cataract surgery).
Aspherical contact lens
A lens with a curve that is not round, but has different
shapes across its surface.
Astigmatism
A condition where the cornea is not equally curved in all
parts of its surface. It is somewhat oval in shape,
causing the visual image to be out of focus (blurred).
Conjunctiva
Transparent membrane that lines the eyelids and the
white part of the eye.
Conjunctivitis
Inflammation of the conjunctiva.
Continuous Wear
Extended wear for multiple nights in a row.
Cornea
Clear front part of the eye that covers the iris, pupil and
anterior chamber.
Corneal erosion
Wearing away of the surface of the cornea.
Corneal ulcer
A sore or lesion on the cornea
Disinfection
A process that kills harmful microorganisms (germs)
which can cause serious eye infections
Extended Wear
Wearing lenses for 24 hours a day, including while
sleeping
Hydrophilic material
“water loving” or water absorbing substance
Hyperopia
Farsightedness
Hypoesthesia
Reduced corneal sensitivity to touch
Iritis
Inflammation of the colored part of the eye (iris)
Inflammation
Swelling, redness and pain
