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.


A common term for hyperopia.