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May 27, 2015

 

In optics, the Abbe Value is a measure of the degree to which light is dispersed when entering a lens, with high numbers indicating low dispersion or low chromatic aberration. It is named after the German physicist Ernst Abbe who defined it.

 

Basically, the Abbe Value refers to the clarity of transparent materials. When looking through a lens at a point other than the optical center, the component colors making up white light...

May 26, 2015

Index of Refraction is the ratio between speed of light in a vacuum and the speed of light in a given material. The resulting number - 1.50, 1.60, 1.67 or 1.74 is referred to as the Index. The higher the number, the more light slows down or bends in a given material. This means a high index lense bends light at steeper angle than a standard lower index lense.

 

Therefore, high index lenses need less curvature to achieve the same...

May 8, 2015

Those are very fashionable for sure, but the gorgeous shades also shield your precious eyes from the very harmful ultraviolet radiation from sunlight and other sources.

 
A cataract is a progressive and painless clouding of the natural, internal lens of the eye. Cataracts block light, making it difficult to see clearly. They occur when there is a buildup of protein in the lens that makes it cloudy. Over an extended period of ti...

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