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For other uses, see Diopter (disambiguation). A dioptre (uk), or diopter (us), is a unit of measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of the focal length measured in metres (that is, 1/metres). It is thus a unit of reciprocal length. For example, a 3-dioptre lens brings parallel rays of light to focus at 1â3 metre.
The main design principle was the Enigma's base curve of 16 diopters which, when placed at a vertex distance of 14 mm from the cornea, allowed the front curve's radius to pass through the eye's center of rotation. In effect, every ray off-axis had a normal incidence to the lens surface wherever the eye looked.