In this paper the performance of Hartmann-Shack wave-front sensor in the aberration measurements of human eyes is investigated and the accuracy and repeatability of measurements are presented qualitatively and quantitatively.
Harmonic diffractive surface element is successfully introduced to the system of infrared dual band in this paper. It has been simultaneously accomplished that the rectification of the Transverse ray, Lateral color and Longitudinal aberration in both band, wave front aberration less ¼ wave length and Modulation Transfer Function of dual band approaching or attaining the diffraction limit. The properties of action spectrum of harmonic diffractive are between refractive element and diffractive, which debased the demand for technical level. The practical design not only shows that the system is compact, few elements and high rates of transmission but also has better weaken-ray aberrations character and 100% cool diaphragm efficiency. The harmonic diffractive element offers a new component for optics designs.