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The City Rule

Designed by Campbell and Obstfeld to take frame and multifocal measurements, the City Rule is an optical ruler that enables the user to accurately measure the following: 

  • Boxed Centre

  • Boxed Lens Size

  • Conventional Inset

  • Geometrical Centre of Segment

  • Geometrical Inset

  • Monocular Centration Distance (This is not a term or measurement defined in a British Standard)

  • Fitting Height

  • Segment Bottom Position

  • Segment Depth

  • Segment Diameter

  • Segment Height

  • Segment Size

  • Segment Top Position


Supplied with instruction manual

The City Rule

SKU: DI002000
  • DI002000

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