by daniel | Nov 16, 2016 | Glasses Terminology
Scratch-resistance Coating Specialized coating for plastic lenses that helps retard scratching or crazing of lenses. Extremely beneficial in most cases for long term preservation of quality vision through your lenses. In the last several years, we’ve seen a...
by daniel | Nov 16, 2016 | Glasses Terminology
Transitional Lenses Lenses that turn dark outdoors and lighten up indoors. Activation is induced by a chemical reaction to ultraviolet (UV) sunlight. Generally, they do not get as dark as sunglasses and will not darken in the car since most car windows block out UV...
by daniel | Nov 16, 2016 | Glasses Terminology
UV Tint Not really a “tint”, but a clear chemical coating used to filter out ultraviolet light. More than a dozen studies have shown that chonic exposure to sunlight without proper protection can increase the chances of developing age-related eye diseases...
by daniel | Nov 16, 2016 | Glasses Terminology
Vertex Distance The distance between a corrective lens and the cornea. An important measurement with moderate to high refractive errors since the final power of a glasses lens or contact lens will depend upon its distance from the retina.
by daniel | Nov 16, 2016 | Glasses Terminology
Anti-relective coating Specialized coating to eliminate light reflections off lenses that can cause unwanted glare, especially at night. Especially useful for high index lenses or lenses that are relatively thick. This coating is considered to be revolutionary for...
by daniel | Nov 16, 2016 | Glasses Terminology
High Index Lenses Lenses that are “denser” and much thinner. These are extremely appealing to those wearing strong corrections. Why? There are two aspects about lenses that correct for near and farsightedness. The lens material and the curve. The greater...
