The Optical Cross: Learn how and why we draw the principle powers and meridians of a lens on paper.
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The Optical Cross:

The combination of a lens front base curve and its back curve (or curves) results in the total power of the lens. This power can be drawn on paper and it can include where on the lens the power is located. When we draw the total power(s) and position, or axis, on paper we call it drawing an optical cross. For optician training or ABO NOCE study, this lesson includes a bench session where we closely examine a spherocylinder lens marked with its two principle meridians. We then go on to draw an optical cross directly from an actual lens. We place powers on an optical cross and we learn to remove a written prescription from an optical cross.

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This video lesson is sponsored by LaramyK Optical

LaramyK 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, highend alternatives to corporate brands. Through craftsmanship, technology, and independent, innovative vendors like Younger, IOT, A&R, and Quantum Innovations we’ve developed the Integrity portfolio of freeform lenses and coatings. Made in the USA, the Integrity brand is not a generic housebrand, but is the absolute best we provide, 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