ISO 18369-1 Ophthalmic Optics - Contact Lenses - Recommendations for Vocabulary, Classification System and Labeling Specifications

ISO 18369-1 defines terms applicable to the physical, chemical and optical properties, manufacture and use of contact lenses. It provides a glossary of terms and, where appropriate, the international symbol and abbreviation associated with a particular term.

This standard also defines terms related to contact lens care products. It also includes classifications of contact lens materials and gives recommendations for labeling contact lens properties.

The standard applies to contact lenses, which are devices that are worn on the anterior surface of the eye in contact with the preocular tear film. This standard covers hard corneal and scleral contact lenses and soft contact lenses.

Rigid lenses retain their shape without support and are made from clear optical grade plastics such as polymethylmethacrylate, cellulose acetate butyrate, polyacrylate/siloxane copolymers, hard polysiloxanes, butylstyrenes, fluoropolymers, and fluorosiloxanes. Soft contact lenses are easily deformed and require support for proper shape.

A very large subset of soft contact lenses consists of clear hydrogels containing water in concentrations greater than 10 percent. Soft contact lenses can also be made of non-hydrogel materials such as flexible polysiloxanes.

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