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Glossary


A thin contact lens with gradually changing power.

Condition in which the cornea has an irregular curvature, often but not always occurring with hyperopia or myopia.

Precise location of the point where correction is needed on the eye.

A number between 7.0 and 10.0 or a phrase, such as steep or flat, that describes the curvature of the eye.

Contact lenses with two or more viewing zones.

A liquid solution that aids in removal of debris from contact lenses.

A contact lens with a tint or color added, either for handling/visibility purposes or to enhance or change eye color.

Brand name of colored lenses, Freshlook Colorblends.

Referred to as the ""window of the eye,"" it is the outermost layer of the eye.

See contact lens.

Thin plastic material designed to fit over the cornea for the correction of a refractive error.

Measurement of how much correction is needed for patients with astigmatism.


Contact lenses that are worn for one day.

Accumulations of substances (usually protein) onto the contact lens.

The width of the eye, measured in millimeters.

Measurement unit of the refractive correction of a contact lens.

Used to disinfect contact lenses.

See Solution.

See Optometrist, Ophthalmologist, or Optician.

A base curve of 8.6 or 8.7.

see Hyperopia.

A condition in which the pressure inside the eye is elevated to a point that can damage the optic nerve and cause a loss of peripheral vision, or blindness.


A condition in which a person can see clearly at a distance but not up close.

Designed for sports use, these tints help objects stand out against a background.

Technique to limit the effects of presbyopia by correcting one eye for hyperopia and the other for myopia.

A contact lens with more than two viewing zones.

Also known as nearsightedness, a condition in which a person can see clearly up close but not at a distance.

See Myopia.

Oculus Dexter, Latin for right eye.

Oculus Sinister, Latin for left eye.

Medical doctor who specializes in eyes. Can perform exams, treat disease and perform surgery.

Not a medical doctor, but licensed to fit and dispense eyeglasses and contact lenses following written prescription from ophthalmologist or optometrist.

Performs exams, diagnoses and treats disease. In some areas they prescribe, fit and dispense eyeglasses and Contact Lenses.

The amount of oxygen diffusing through contact lens material under specified testing conditions.


See Sphere.

Also known as farsightedness, a condition in which a person can see clearly at a distance but not up close.

Used as a lubricant to increase comfort.

A contact lens made of slightly flexible plastics that allow oxygen to pass through to the eyes.

Liquid solution that removes debris from contact lenses in preparation for use.

Prescription.

There are many different types of solutions, made for different types of contact lenses.

A measurement of how much correction is needed, it is a number between -20 and +20.

A base curve of 8.3 or 8.4.

Depending on the contact lens, there are different types of tint such as a handling or visibility tint, light filtering tint, enhancement tint or color tint.

Contact lens designed to correct astigmatism by bearing two different powers at right angles.

Lightly tinted lenses for easier insertion and removal.

Brand name, lightly tinted lenses for easier insertion and removal.