The DIN German Institute for Standardization (DIN), the European Committee for Standardization (CEN) and the International Organization for Standardization (ISO) are responsible for establishing fundamental technical standards and for stipulating the procedures and terminology used in optometry.
These institutions specify and constantly update the parameters which are essential for quality and uniform international standards.
The European Union
Within the European Union, merchandise must be able to move without obstruction and it must meet basic requirements with regard to its safety, suitability and performance. To achieve this goal, directives are compiled which must be implemented in the national legislation of the individual member states.
Since June 14, 1998, the CE (CE = Communité Européen [European Community]) labeling requirements have been in force for products to which EU directives and the relevant standards apply.
The CE marking is the consumer’s guarantee that the minimum safety and performance requirements are met by the product to the extent stipulated by standards.
The ZEISS guarantee certificate you receive from your eye care professional with your new eyeglass lenses verifies that you have purchased a high-quality product.
It contains, for example, the 6 criteria which are distinctive characteristics of ZEISS quality:
The best way to clean your lenses is to hold them under cold, running water using pH-neutral cleaning agents. Dirt particles are simply washed off and therefore cannot cause any damage to the surface when the lenses are dried with a clean, soft cloth. For cleaning your lenses when you are out and about, we recommend the microfiber cloths and the special ZEISS lens cleaning agent. Other textiles may cause scratches on your lenses.
Important: Please do not expose your lenses to high temperatures of over 80 °C (e. g. in the sauna or on the dashboard of your car in the summer).
This standard, which was compiled with the participation of international experts, specifies the basic requirements to be met by finished, uncut eyeglass lenses. These requirements cover subjects such as physiological compatibility, flammability, testing for mechanical strength and the transmittance of uncut, finished eyeglass lenses.
Apart from DIN EN ISO 14889 and 8980-3, there are other standards which are also essential for ophthalmic opticians and optometrists which go into more detail with regard to the various types of ophthalmic lenses and their mounring: