Glass 1.9 or Plastic 1.74 Double Aspheric, which is the thinnest lens?

Glass 1.9 or Plastic 1.74 Double Aspheric, which is the thinnest lens?

People with strong or complex prescriptions are always looking for the thinnest possible lenses to avoid embarrassingly thick glasses where the lenses either stick out from the side of the frame or bulge in the centre.  Until recently their choice of lenses was limited, but now thanks to the latest advances in thin lens technology….

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