Eyeglass lenses thickness?

Question

My prescription is
R: -2.25, -.750 100
L: -2.75

Can you give me an idea how thick my lenses are going to be? I ordered those thicker plastic frames that are in fashion now. But, I want to make sure my lenses wont stick out. The lenses I ordered are plastic resin CR-39. I need to know whether to call them back to have it changed to polycarbonate lenses which are thinner. I'm tight on cash, but I don't want to get stuck with ugly glasses for a whole year.

Answer 1

The thickness at the edge depends on the overall size of the lens. The further you get from the focal point, the more material is needed to keep the required curvature.
But, for your prescription, if made to an average size lens, I would expect the edge thickness to be about 1/4 inch.

Answer 2

Polycarbonate is generally considered a better option than CR-39, due to the fact that it is thinner and lighter. Poly also is more impact resistant than CR-39, and also has a built-in UV protection, even in clear lenses. CR-39 does not have UV protection built in. The only downside to polycarbonate is that you may notice distortion around the edges of the lenses. To help make this less noticeable, try anti-reflective coating. Most likely though, with a thick plastic frame, you won't notice a great deal of the lens sticking out with either kind of lens, but the CR-39 will stick out a bit more than the polycarbonate.

Answer 3

CR-39 lenses have a high scratch resistance, low transparency for Ultra Violet and Inferred radiation. You picked the right lenses. Also for your prescription CR-39 would be a much better choice than polycarbonate lenses.

Answer 4

Yes. When you polish the edges only, it makes them super shiny, which looks better and less noticeable. I worked in a eye doctor's office for three years, and I would always polish the edges for my patients, even if they were thin lenses. You definitely want to get them polished if they are rimless or drill mounts.

Answer 5

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