EN ISO 9337-1 : 2000

Foreword
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
Annex ZA (normative) Normative references to international
         publications with their relevant European publications
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.