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Frame Information

Published: 2006-08-30

Aperture
The opening in an eyeglass front into which a lens is inserted.  Aperture dimensions (in millimeters) do not include the depth of the bevel groove.
Arm pad (guard)
That part or extension of the spectacle frame or mounting that connects the pad retainer to the front or the bridge.
Barrel
The frame component on an eyewire that interlocks or closes the eye wire down on the lens
Boxing System
A system of measurement used to define various prescription requirements relative to lens and frame dimensions.
  • A-dimension (eyesize, lens size)
    A measurement of the Boxing System which measures the distance between Vertical tangents to the bevel of a lens.
  • B-dimension
    A measurement of the Boxing System which measures the distance between horizontal tangents to the bevel of a lens.
  • Distance Between Lenses, Bridge size (DBL)
    The minimum horizontal distance between lenses, as measured in Millimeters at the apices of their bevels.
  • Effective Diameter (ED)
    A linear measurement, expressed in millimeters, equal to twice the longest radius of an ophthalmic lens measured from its geometric center to the apex of its edge.  Defines the minimum lens that will fit a frame when the geometric center of the lens is exactly centered in the frame.
Bridge
The supportive structural member connecting the two eyes of an ophthalmic frame front.
  • Bridge, keyhole
    A bridge design for a front that does not permit continuous contact between the nose and the front in the area of the nasal crest.
  • Bridge, saddle
    A bridge design for a front that permits continuous contact between the nose and the front in the area of the nasal crest.
     
Distance Between Centers (DBC)
The horizontal linear distance between geometric centers of the two eyes of a frame front.
 
Frame information card
Card included with all frames you receive from SWEEP Optical.  On the frame information care is the frame name, color and size.  Needs to be saved and returned with the frame to receive full credit. 
 
Geometric Center
The intersection of the horizontal and vertical centerlines of a box that circumscribes the lens shape.
Pattern
A cam, or template, used in lens edging equipment to generate the correct peripheral shape and geometric center location. Also called a lens former.
Temple
Component of eyeglass frame connected to the front at the end piece and extending over the side of the skull. 
Temple, library
The style of temple that has almost no bend over the ear; it was originally designed for ease of removal.
Temple, riding bow
A style of temple which bends around to hug the ear. It is particularly useful to people whose jobs are very active, or for small children.
Temple, skull
A style of temple that has a slight bend which allows the frame to fit easily over the ear, and to hug the head lightly.

Temple spatula

Another term for skull temple; also called paddle temple.

Temple screws

Tiny screws which connect the front and temple halves of the hinges.

Front

 

A component of eyeglass frame consisting of bridge, rims and usually end pieces; functions is to retain the ophthalmic lenses.

Author: Source: Dictionary of Ophthalmic Optics