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  • Eyewear Lexicon

    Eyewear Lexicon

 Eyewear Lexicon


A material widely used in plastic frames. Due to its high transparency, acetate provides bright and beautiful lustrous colours.


A light and soft metal with high processability in production.  While 40% lighter than titanium, it is inferior in terms of strength and corrosion resistance.  Used for many years in the manufacturing of temples.


A frame shape used by the US air force that has become an eyewear icon.

"A" measurement

The width / horizontal measurement of a lens.

AR Coating

Anti-Reflective coating.  A coating that eliminates the reflection from the concave side of the lens, and protects it from scratches and/or adherence of dirt.

Beta Titanium

A titanium alloy consisting of titanium, vanadium and aluminum. Stronger than pure titanium, but just as lightweight and corrosion-resistant. Due to its elastic properties, even a thinly designed beta titanium frame retains its strength.


The part between the two rims, which extends across the nose.

"B" measurement

The depth / vertical measurement of the lens.

Bifocal Lens

A lens with two focal areas: typically with a far-sighted correction on top and near-sighted area on the bottom of the lens.

Carbon Fibre

It is used in the body of racing cars, car bumpers, aeroplane construction, and, to a degree, in eyewear. It is extremely abrasion-, heat-, and acid-resistant.


A manufacturing process mainly used to create end pieces or ornamental parts. A processing method in which beryllium copper or titanium is melted then cooled in a mould to form the parts.


A technique used to decorate certain details of the frame with resin. Its stereoscopic and transparent effect creates a decorative and high-value frame.


A square shape transformed from the aviator.

Cat Eye

A retro frame style in which the outer edges of the almond shaped lenses are upswept. Also called the 'Monroe style' as the style was recognisably worn by Marilyn Monroe.

CR lens

A commonly used lens made of Carbon Resin known as CR 39 with a wide variety of colours ranging from full colours to gradated colours.


A very light aluminum alloy, inferior to titanium in strength and corrosion-resistance, but lighter in weight.


DBL = Distance Between the Lenses

Also called the bridge size, it refers to the minimum horizontal distance between the lenses.


A new titanium alloy that offers high flexibility and memory function, and is nickel free.  Patented by CHARMANT Group.

Electric Coating

A coating technique that electrically applies coloured resin onto the surface of a frame. It embellishes the frame whilst also making it corrosion-resistant.


A secondary surface treatment of thin, highly adhesive coloured film. Mostly used for the rim colour to enhance embellishment. It provides a lighter expression than cloisonné.

 Tip End

The end of the temple that rests over the ear.


End Piece

The portion of the frame that extends outwards from the front piece and connects to the hinges.

ED measurement

ED = Effective Diameter.

It indicates the minimum size/diameter of the lens to be used.