Lens Tilt And Perceived Power: Why It's Important And How It's Calculated скачать в хорошем качестве

Lens Tilt And Perceived Power: Why It's Important And How It's Calculated

Most of us know the concept of vertex distance, that as a lens moves away from or closer to the eye, the lens is perceived as having gained or lost power. The same is true for when we tilt a lens. A lens when tilted will have a perceived change in its sphere power and develop perceived cylinder. The amount of perceived change is calculated using a complex, two-part formula. We hit the whiteboard and work through an example using a simple, poly, +12.00 spherical lens tilted 15 degrees. Learn More: https://opticianworks.com/ This week we revisit compensated lens design. Most of us know the concept of vertex distance, that as a lens moves away from, or closer to the eye, the lens is perceived as having gained or lost power. The same is true for when we tilt a lens. A lens when tilted will have a perceived change in its sphere power and develop perceived cylinder. Optician training includes understanding optical formulas. The amount of perceived change is calculated using a complex, two-part formula. That formula is the Effective Power Formula. Opticians use the formula to determine perceived power changes in lenses. We hit the whiteboard and provide an optician training video where we work through an example using a simple, poly, +12.00 spherical lens tilted 15 degrees. Learn More: https://opticianworks.com/ Connect with us:   / opticianworks   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