Contact Lens Evaluation, Fitting, and Follow-Up Care (CLEFFU)

If you wear or want contacts, you need a contact lens exam in addition to a comprehensive eye exam. Your eye doctor will perform special tests during a contact lens exam to evaluate your vision with contacts. The first test will measure your eye surface to determine what size and type of contacts are best for you. Your doctor may also do a tear film evaluation to make sure you have enough tears to comfortably wear contacts.

With the results of those tests, your eye doctor can provide a contact lens prescription that is the right fit for your eyes. An eyeglass prescription is no substitute for a contact lens exam because the two are very different. An eyeglass prescription measures for lenses that are positioned approximately 12 millimeters from your eyes; whereas a contact lens prescription measures for lenses that sit directly on the surface the eye. An improper fitting or prescription of contacts can damage the health of the eyes. Once you have the correct fit and prescription for contacts, you’ll need to decide whether you want disposable contacts or extended wear, and if you want your contacts to be colored.

Your doctor will fit you with a trial pair of contacts and have you wear them for a few days. In about a week, you’ll need a follow-up exam to make sure you have adjusted to your new lenses. Whether you wear glasses or contacts, it’s a good idea to get a yearly eye exam to see if you have new or existing vision problems, and if you need vision correction.


The movement of the eyes in such a way that the internal recti turn the visual axes to intersect at some finite point.


Transparent portion of eye in front of the iris (colored part).


The specific lens prescription power required by a patient to render the best vision possible.


The part of a prescription that indicates the correction needed for an astigmatism.

Diagnostic Dilation

The opening of or enlarging of the pupil by means of eye drops to better see inside the eye.

Digital Single Vision Lenses

See Lens, Digital single vision.

Dilated Examination (Dilation)

The enlargement of the pupil by the application of diagnostic drugs in the form of eye drops. The larger pupil opening allows more detailed inspection of the peripheral retina to facilitate diagnosis and documentation of numerous potential diseases or disorders.


A unit of measure used in optics to designate less power, curvature or prism.

Dominant Eye

The eye that leads its mate during eye movements.


Diagnostic Pharmaceutical Agents. A term used by eye doctors for eye drops used for diagnostic purposes during an eye examination.

Drill Mounts

Where the lenses are drilled to allow for mounting screws with rimless frames.

Edge Polish

Edge of lens is polished from a cloudy appearance to a clear transparent edge.


The process of cutting a lens blank to the appropriate size and shape required for a particular frame.


Eyewear Dispensing Program is the name for the new directed lab model of Versant Health.


Essilor is the largest eyewear manufacturer in the world with a nation-wide network of labs.

Executive Bifocal

Bifocal in which the near (reading) portion is across the entire bottom of the lens. Useful for extended close-up work (e.g., bookkeeping) at a desk.


The sense organ responsible for the sense of vision.

Eye Care Professional

An Ophthalmologist, an Optometrist or an Optician, as defined by the Plan, who has signed an agreement with the Claim Supervisor to provide Covered Services to Enrollees.


A term commonly used to describe an ophthalmic frame with lenses inserted.