Polarising gauge helps reduce glazing errors

Norville Autoflow has released an axis verifier gauge for correct glazing of polarised lenses.

The company said ISO BSI standards allowed +5° as the glazing axis tolerance for polarising lenses, rather than the glazed cylinder axis which sometimes can have a much wider allowance depending on its lens power.

More serious errors could occur when glazing polarising lenses, such as a complete 90° swing of the polarising axis, which the company said was an easy mistake to make with spherical polarising powers as technicians neglected to recall there was an axis to a polarising spherical power.

‘This little gadget will catch such errors before they get onto a patient’s face – worth their weight in gold we could say,’ said a Norville spokesperson.