High Index Lenses…Avoiding the “Coke Bottle” look

When choosing new glasses, most people spend a lot of time carefully choosing a frame, but hardly spend anytime time at all considering their lenses; material, design, coating, etc. Right now, let’s focus on materials. Back in the early days of vision correction, all lenses were made from crown glass, hence the term “glasses.” Now in more modern times, plastic is most commonly used. Starting in the late 40’s, plastic started being used for lenses, and became very popular because it was roughly half the weight of glass lenses, low cost, and still offered excellent optics all the while being safer then glass. The only downside was the thickness of these lenses in medium to higher prescript

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