Sweep Optical Frames http://www.sweepoptical.com/press_and_articles/ Sweep Optical Frames en-us optical frames lenses Frame Information Frame_Information 21
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.
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  • 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. ]]> Wed, 30 Aug 2006 13:08:57 PST http://www.sweepoptical.com/press_and_articles/Frames/Frame_Information/ http://www.sweepoptical.com/press_and_articles/Frames/Frame_Information/ Frame materials Frame_materials 20 Plastic
Plastic frames are great for color and multicolor frames. However they are easier to break than most metal frames. Aging and sunlight exposure will decrease their strength. The following materials are considered plastic frames:
Zyl
(zylonite or cellulose acetate) - Cost effective lightweight, hypoallergenic frame material available in a variety of colors and shapes.
Propionate
Nylon-based plastic that is hypoallergenic. It is lightweight, and has a different look and feel than other plastics
Blended Nylon (polyamides, co-polyamides, gliamides)
Strong and lightweight. Sport and performance frames (typically made of gliamides) are resistant to hot and cold, more flexible-yet stiff. Popular for wraps and other hard to produce shapes.

Metal

Aluminum
A lightweight, relatively strong metallic chemical element, highly resistant to oxidation, used in ophthalmic frame construction; can be anodized to yield a variety of colors
Monel
Made of a mixture of any of a broad range of materials. It is the most widely used material for frames being used today. It is malleable, and can be made corrosion-resistant. A special nickel free coating needs to be used to make corrosion-resistant.
Stainless Steel
Lightweight, Low toxicity, and strong, many are nickel free, and therefore hypoallergenic. Stainless steel is readily available and reasonably priced. It's an alloy of steel and chromium; most stainless steels contain anywhere from 10 to 30 percent chromium, which imparts an excellent resistance to corrosion, abrasion and heat.
Nickel
many metal frames are nickel alloy, low cost and durable, but may cause allergic reaction.
Nickel Silver
Alloy made of nickel and silver
Titanium
Strong, durable, lightweight, resistant to corrosion, and available in various colors. Some titanium frames are made of an alloy with other metals such as copper or Nickel. Titanium frames are generally more expensive than other metal frames.
Flexible Titanium
Lightweight alloy with titanium base, aka "memory metal", that retains shape and is hypoallergenic and resists corrosion.

Semi Rimless

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