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Standard

NS-EN ISO 9342:1998

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Abstract

This International Standard specifies requirements for test lenses for the calibration of focimeters. NOTE 1 It is accepted that other test lenses can also be used with powers within the given range, manufactured to the same standard of accuracy and form, but different back vertex powers. However, only lenses with integer nominal powers, as described in annex A, can be used for the calibration of digitally-rounding focimeters.

Document information

  • Standard from SN
  • Published:
  • Withdrawn:
  • Edition: 1
  • Version: 1
  • Document type: NAT
  • ICS 11.040.70
  • National Committee CEN/TC 170

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