diopter

diopteri A unit of measure of the power of a lens or mirror, equal to the reciprocal of its focal length in meters. myopia Myopia is diagnosed and measured in diopters.
puhekieltä Any lens system, such as a telescope.
puhekieltä A theodolite or similar surveyor’s angle measuring device.
puhekieltä An alidade.
puhekieltä A surgical speculum.
puhekieltä An instrument for drawing the skull by projections.