The unit of power employed by spectacle-makers is termed the diopter or dioptric (see Spectacles).
Two methods of lighting have been employed—the Catoptric and the dioptric systems.
This optic embodied the first combination of dioptric and catoptric elements in one design (fig. 34).
In order to complete the dioptric apparatus a lens is necessary.
A dioptric apparatus for the purpose of forming an image on the sensory cells.
We have (with the consent of the author) altered these to the dioptric system.
This may be made of ground glass, opal glass, or be a dioptric globe such as the holophane.
In fishes and reptiles, as Owen has remarked, "The range of gradation of dioptric structures is very great."
A new lantern and dioptric apparatus were erected on the tower in 1902.
Another classification divides the instruments themselves into three classes: (a) catoptric, (b) dioptric and (c) catadioptric.
Relating to the refraction of light, especially by a lens. Dioptric lenses are used in Fresnel lenses and camera viewfinders. Compare catadioptric, catoptric.