Definition of dioptric in US English:



  • Relating to the refraction of light, especially in the organs of sight or in devices which aid or improve the vision.

    • ‘The dioptric power of this liquid lens depends on the refractive indices of the materials and the radius of curvature of the interface.’
    • ‘If the lens had an index of 1.53, the dioptric value of that radius of curvature would be 4.64 diopters.’
    • ‘The dioptric system helps focus the image on the retina.’
    • ‘Canon dioptric lenses only handle simple eyesight defects of long and short sight, they may not help other eyesight problems.’
    • ‘I wouldn't think the dioptric adjustment would be something that would get out of alignment easily.’


Mid 17th century: from Greek dioptrikos, from dioptra, a kind of theodolite (see diopter).