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Updated Shazam! Lens Calculator


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Is fitting variable focus lenses confusing?
Eliminate the confusion with PRIO’s Shazam! lens calculator.

The Shazam! lens calculator is the quick and easy way to determine the best near variable focus lens for your computer-using patients. PRIO originally developed the revolutionary Shazam! lens calculator as a quick and easy way to take the mystery out of calculating the correct power to order, and to determine the best NVF lens for a computer-using patient

Shazam! 4.0Shazam! Easy as 1, 2, 3!
Enter a patient’s distance Rx, reading add, and computer (PRIO) add and Shazam! instantly recommends the best fitting lens from PRIO’s family of variable focus lenses as well as the popular Nikon Online series of lenses.

  • Print the results, or save in a PDF format with the patient’s electronic record.
  • Use as an educational tool with the patient.
  • Include a copy with the lab order to eliminate any confusion.


Use Shazam! now
Online version
Shazam! 4.5 Flash


Download Shazam! (requires login)
Download Shazam!
Flash version for
Windows 9x, NT, 2000/XP

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