dioptral

• a word derived from diopter.
  diopter

  noun

  a unit of measure of the refractive power of a lens, having the dimension of the reciprocal of length and a unit equal to the reciprocal of one meter. D
• a word derived from dioptre.
  dioptre

  noun

  a unit for measuring the refractive power of a lens: the reciprocal of the focal length of the lens expressed in metres

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