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Crizal is the brand name of a Canadian range of optical lens coatings manufactured by French Essilor. Its products were created to allow greater transparency in lenses by repelling rain and being anti-reflective, smudge-resistant, dust-resistant and scratch-resistant.
The Crizal technology was developed using technology from the micro-electronics, flat screen and fiber optics industries. The original Crizal coating specialized in anti-reflective technology, smudge resistance and scratch resistance.
The anti-scratch layer is provided by a double varnish that involves the introduction of a shock-absorbing layer.
The original Crizal was an anti-reflective, scratch resistant and anti-smudge coating.
The Crizal Alizé coating marked a serious improvement on the original Crizal's anti-smudge and anti-dust properties. It contains a high proportion of perfluorinated molecules to fill in the microscopic cracks on the surface of the lens, making it much smoother. This translates into a better performance against dust and smudges.
The Crizal Alizé with AST coating was launched in March 2006 on the Canadian market. Combined to the original Crizal's anti-smudge and anti-dust properties, Essilor's AST technology provided an improved level of anti-reflection.
The AST technology was developed by preparing the lens surface through ion bombardment to ensure a better adhesion of the molecules that make up the anti-reflection coating layers. By using this process, it was possible to introduce an ultra-thin conductive layer to neutralize[disambiguation needed] the electrostatic charge on the surface of the lens so that it would not attract dust particles after cleaning.
In 2008, Essilor of America (the American subsidiary of Essilor International) signed a licensing agreement with 3M to market a new generation of the Crizal Alizé, called Crizal Avancé with Scotchgard Protector. This new coating combined the anti-reflective, durability and ease of cleaning properties of Crizal Alizé with the protective qualities of Scotchgard Protector.
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%). It also added a new and improved version of its anti-smudge layer.