Computer model of Hartmann Wavefront Analyzer (microlens matrix for wavefront shape determination).
What is Shack-Hartmann wavefront sensor: https://en.wikipedia.org/wiki/Shack–Hartmann_wavefront_sensor About optical aberrations: https://en.wikipedia.org/wiki/Optical_aberration
Keywords: FFT, Fast Fourier Transform, Optics, Zernike, Hartmann, Shack–Hartmann wavefront sensor, Optical aberration