FIELD: physics.
SUBSTANCE: in the method, light is passed through a diffraction lens to an array of elementary lenses, wherein each elementary lens receives a portion of light and the diffraction lens has a zonal boundary covering at least part of one elementary lens. Properties of the diffraction lens are measured based on light focused by the array of elementary lenses and picked up by a detector. The measurement result is adjusted in order to compensate for the assumed optical properties of the diffraction component of the lens in the measuring system. Fuzzy spots and/or double spots can represent diffraction zones of the wave front. The centroid of the spot or the brighter of the two spots can be used to determine the transverse position of the spot. Theoretical calculations, laboratory measurements, clinical measurements and experimental images of the spots can be generated, compared and mutually checked to determine the equivalent single-focus lens.
EFFECT: using diffraction lenses to compensate for optical effects arising due to that the wave front is not smooth and continuous, and local slopes of individual zones and discontinuity on diffraction steps affect the position of the spot.
16 cl, 19 dwg
