How To Calculate Resultant Prism

Verifying a Job With Compound or Resultant Prism

This week we field a question posted on our Facebook page about verifying a job with compound prism. Unlike simple prism problems that we solve with Prentice’s Formula, calculating resultant prism requires a different approach. Verification cannot begin until we determine the exact position where the required prism amount will fall within the lensmeter reticle.


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This video lesson is sponsored by Laramy-K Optical

Laramy-K Optical is a digital uncut and coating lab unlike any other. The only exclusively uncut lab in the country; we provide our customers with independent, high-end alternatives to corporate brands. Through craftsmanship, technology, and independent, innovative vendors like Younger, IOT, A&R, and Quantum Innovations we offer our customers the Integrity portfolio of freeform lenses and coatings. Made in the USA, the Integrity brand is not a generic house-brand, but is the absolute best available, designed to give the wearer that “wow!” experience.

In addition to the digital line, we still offer conventional surfacing, including glass. Maintaining traditional equipment gives our customers vastly more flexibility in their dispensing, particularly when it comes to more difficult prescriptions.

Learn More: http://www.laramyk.com