Crizal

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French Crizal Logo

Crizal is the brand name of optical lens coatings manufactured by the French corporation Essilor. Its coatings were created to allow greater transparency in lenses made of certain plastics by repelling rain and being anti-reflective, smudge-resistant, dust-resistant, and scratch-resistant.[citation needed]

Technology[edit]

The Crizal technology was developed using technology from the micro-electronics, high-definition, and fiber optics industries.[1] The original Crizal coating specialized in anti-reflective technology, smudge resistance, and scratch resistance.

Anti-smudge[edit]

The anti-smudge layer on the Crizal coating was developed by using perfluorinated polymers which were applied directly after the last antireflection layer using a vacuum deposition process.[2]

Anti-scratch[edit]

The anti-scratch layer is provided by a double varnish that involves the introduction of a shock-absorbing layer.[2] These lenses need to be made correctly to prevent crazing and crackling of the glass. Sudden heat exposure etc. can cause the lens to crackle.

Products[edit]

1993: Crizal[edit]

The original Crizal was an anti-reflective, scratch resistant, and anti-smudge coating.

2003: Crizal Alizé[edit]

The Crizal Alizé coating is claimed to improve on the original Crizal's anti-smudge and anti-dust properties.[3][verification needed] It contains a high proportion of perfluorinated molecules to fill in the microscopic cracks on the surface of the lens, purportedly making it smoother and more resistant to dust and smudges.

2006: Crizal Alizé with AST[edit]

The Crizal Alizé with AST coating was launched in March 2006 on the Canadian market.[4] Combined with the original Crizal's anti-smudge and anti-dust properties, it is claimed to provide an improved level of anti-reflection.

The AST technology was developed by preparing the lens surface through ion bombardment to promote better adhesion of the molecules that make up the anti-reflection coating layers. By using this process, it was possible to introduce a thin conductive layer to neutralize the electrostatic charge on the surface of the lens so that it would attract fewer dust particles after cleaning.

2008: Crizal Avancé with Scotchgard Protector[edit]

In 2008, Essilor of America (the American subsidiary of the French company Essilor International) signed a licensing agreement with St. Paul, Minnesota-based 3M to market a new generation of the Crizal Alizé, called Crizal Avancé with Scotchgard Protector.[5]

2009: Crizal Forte[edit]

The Crizal Forte coating introduced a new layer of coating between the already existing anti-scratch and anti-reflection which was done to enhance scratch resistance keeping a high transmittance of light (99%).[6] It also added a new and improved version of its anti-smudge layer and water repellence.

References[edit]

  1. ^ http://www.essilor.com/Crizal,191
  2. ^ a b Stephenson, Louise & St-Jean, Danielle. "Lens coatings: How the companies make them rock hard and crystal clear" Optikmag, February 1997.
  3. ^ Wilkinson, Peter. "Coatings and tints: Product availability and choice". Optometry Today, February 24th 1996.
  4. ^ Stephenson, Louise & St-Jean, Danielle. "Lens coatings: How the companies make them rock hard and crystal clear" Optikmag, February 2007.
  5. ^ "Essilor licenses Scotchgard brand from 3M for new Crizal lens" VMail, January 7, 1998.
  6. ^ "Nouveau traitement antireflet pour Essilor" Les Echos, April 7, 2009.

External links[edit]