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Lens ThicknessYour prescription (a small or large correction) will have an effect on the thickness of your lens.
A prescription with a "minus" in front of the SPH value means that the center of the lens will be thinner than the edges. A prescription with a "plus" in front of the SPH value means that the center of the lens will be thicker than the edges.
In either case, if you get a lens that has a higher "refractive index" (meaning it's a more efficient material that can do more correction with less thickness) you can reduce the thickness of your lens.
If you have an SPH in the range of zero (plano) to +/- 2, you can probably get away with the lenses that come included with our basic prices. (Note that the CYL value in your prescription can also have an effect on thickness.)
Should you want to investigate some more about lenses and their contribution to the process of seeing more clearly...read on and on and on, on the FAQ page.