Interactive PAL Chart (old)

The ever-popular LKO PAL Chart has been made even better and superceded by our the Lens Availability Database. The Lens Availability Database contains the most up-to-date lens data available on the web and includes advanced search features. We're sure you'll like the...

Basic Refraction Procedures for Opticians

Many opticians around the country have shown great interest in learning the procedures involved but have been unable to take a course on the subject. This article is designed to introduce the subject to those interested, and to provide some continuing education to...

The Electromagnetic Spectrum

Produced by the nuclear cauldrons of stars and all matter in the cosmos, energy in the form of electromagnetic radiation permeates our entire universe. Every second of every day we are bombarded with and surrounded by electromagnetic radiation; some bounces off of our...

Lens Power

As light rays pass through a lens with power, the rays are bent or refracted. In a lens with a plus power, the light rays converge or are refracted toward one another. The point at which the light rays converge is called the focal point and in a plus lens, is behind...

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