NEN EN ISO 9337-1 : 2000

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Determination of back vertex power
   4.1 Principle
   4.2 Apparatus and reagent
   4.3 Conditioning of lenses prior to testing
   4.4 Procedure
         4.4.1 Calibration
         4.4.2 Measurement of back vertex power of
                 rigid contact lenses
         4.4.3 Measurement of back vertex power of
                 hydrogel contact lenses
5 Expression of results
6 Precision data
7 Test report
Annex A (informative) Precision data
Bibliography

Gives test procedures for determining the back vertex power of both rigid and hydrogel contact lenses in air using a focimeter with manual focusing. Applies to finished contact lenses.