by admin | May 5, 2010 | Lens Form and Theory
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...
by admin | May 5, 2010 | Lens Form and Theory
Prism can be used to correct vision for an individual whose eyes are not perfectly aligned as with, for example, a patient with strabismus. When the eyes are not aligned, the right and left eye see different images resulting in blurred or double vision. Sometimes the...
by admin | May 5, 2010 | Low Vision
Low vision patients are the most under-treated, under-referred and generally overlooked patients in many eyecare practices. With the current growth in the elderly population, this may be a perfect time to re-evaluate your approach to this ever-expanding group of...
by admin | May 5, 2010 | Finishing
Strange but True: You can easily remove most scratches from 1.60 and 1.66 product with a bowl of water and a microwave. Here's how: 1. Place scratched lens(es) in a bowl of water. Use enough water to ensure the lenses remain covered during the heating period....
by admin | May 5, 2010 | Lens Options and Materials
The following videos show the results of drop tests perfomed by Younger Optics on CR-39, Spectralite, 1.60, Polycarbonate, and Trivex. All tests were perfomed using a 500g missile with a 1 mm point. The lenses tested were all front-side coated with a center thickness...
by admin | May 5, 2010 | Lens Form and Theory
Aspheric lenses are defined as lenses that are non-spherical. This non spherical surface encompasses all kinds of lenses from aspheric, atoric, progressive, and aphakic. So if all these lenses fall in the definition of an aspheric lens, how do we further define and...
