For the Expert

For the Expert

More about eyeglass lenses and other corrective devices:
ZEISS also offers special solutions to many unusual problems. Extend your knowledge of special, custom-made products and learn a few fitting tips for ZEISS lenses.

Fitting ZEISS Lenses

To guarantee maximum wearing comfort, an exact fitting procedure must be followed for each type of lens. The following recommendations for centering ZEISS lenses take into account the respective centration requirements as well as the requirements for the center of rotation and field of view.

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Prescribed and Measured Powers

The measured value is the dioptric power in the major reference point of a lens and is measured in the focimeter using a defined measuring technique.

The prescribed or wearing power is the dioptric power experienced by the user in the major reference point in a defined wearing situation.

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Special Production

Sometimes specially produced lenses are required outside the standard range.
This may be advisable if the wearing comfort of the lenses can be improved,
e. g. with specially computed, thinner lenses produced using the OPTIMA technique.

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Standards and Directives

Various groups of people, including employees working for public authorities, in the business sector, in industry and in science and research as well as the general public comply with the standards issued by the DIN German Institute for Standardization.The DIN authorities play a major role in the compilation and publication of standards within CEN and ISO.

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