Lens Materials High Index Lenses Don’t Let Your Glasses Weigh You Down — Choose High Index Lenses High index lenses are chosen for their lightweight comfort and attractiveness. High index lens materials are lighter in weight and thinner than their regular glass or plastic counterparts. The benefit is that if you have a strong prescription,…

ASPHERIC LENSES Ever since aspheric lenses were introduced for conventional prescriptions in 1989, Eyecare Business has been covering this rapidly growing category. For 40 years prior to that time, aspheric lenses had represented the most complex lens design for eyeglasses a design that was limited to the post-cataract field. The cosmetic and visual advantages for…

This is Stephen’s Quintet, A compact group of galaxies, discovered about 130 years ago, located about 280 million light years from Earth Beautiful Chaos | Universe Today

1. Choose and Adjust Frame a. when choosing a frame be aware of your B measurement (frame depth) b. avoid frames that deeply cut away from the nasal (some aviator shapes) c. Adjust nose pads as if dispensing frame d. Adjust temples to straighten horizontal fit (leveling) e. Adjust frame to fit close to eye…

This is a very basic and simple approach to explaining aspheric lenses. They feature a different lens design than the standard spherical lens. To understand the aspheric concept, you have to consider two components of a lens that affect how light travels through the lens. The first is the index of refraction and secondly is…

Vitamin A – We all remember our mothers telling us to eat our carrots so we could have eyes like an eagle. Why did our mothers tell us this? What do carrots really do for us? Carrots contain a carotenoid called beta-carotene. Carotenoids are pigments in plants and animals that provide red and yellow color….

The Development of Opticianry In early times customers made their selection from a tray of eyeglasses which were already assembled and which contained standardized non-prescription lenses. Today, this same procedure is still followed in some novelty and drug stores where ready made reading glasses are selected from a display. As could be expected the practitioners…

Different lenses have different properties. The density varies, known as index of refraction, and the ABBE VALUES are different for the various materials. The ABBE VALUE is a number given to describe the amount of chromatic aberration of an ophthalmic lens material. Here is a list of ABBE VALUES. The higher the number, the less…

FACT – UVA & UVB RAYS ARE HARMFUL More and more people are aware of the dangers caused by the sun. Your eyes, as well as your skin are at risk every time you step outside. You can reduce the risks of damaging your eyes by wearing sunglasses. What does ultraviolet (UV) mean? Ultraviolet is…

All about anti–reflective coatings Anti-reflection coatings are made from extremely thin layers of different dielectric materials that are applied in a high vacuum onto both surfaces of the lens. The quality of the AR depends upon the number of layers applied to the lens. The early coatings had only a single layer of magnesium fluoride…