Nominal Lens Formula Part 4 - The Most Common Exam Question

This week we have the fourth and final part of our look at the nominal lens formula with the most common version of a question you’ll likely find on an optician exam. The formula is a way of looking at and thinking about the basics of lens design. Opticians use the nominal lens formula when calculating lens power. Optician training includes base curve theory and toric transposition. The formula allows us to determine the approximate power of a lens (DL) by understanding the relationship between the lens front base curve (D1) and the curve or curves placed on the back of it (D2). This week we solve the Nominal Lens Formula just as it is written DL = D1 + D2 when we solve for DL when we have D1 and D2. 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