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New Rimmed Prism Trial Lenses

Ellivron launch new progressive rimmed Trial Lenses 


New Rimmed Prism Trial Lenses produced by Frank Norville’s new company Ellivron Optical


Whilst processing a number of rotating prism projects it came to our notice how those very traditional reduced aperture prism trial rims (pictured right)


It has been overtaken in design terms by a new injection moulded plastic castellated rim model.

This has the distinct advantage of enabling considerably higher levels of dexterity to prevail during handling especially when rotating around a ring holder trial frame.

Its series of plastic protrusions, or castellations around its rim aids this (pictured left).

This standard diameter reduced aperture ring 35mm holds a rectangular prism 20x25mm with powers marked (twice) and arrowhead print for apex and dot for base directions.

48 prism powers per boxed set including a four lens position hand verifier.


The New Rimmed Prism Trial Set is now available from Ellivron Optical 

It includes a 48 piece reduced aperture prism set, two rings of each power.

Power Range

  • 0.25 to 4.00 in 0.25 increments
  • 4.50 to 6.00 in 0.50 increments
  • 7.00 to 10.00 in 1.00 increments


The price is SP £168.00 exclusive of Vat & PP

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