Adaptive Aberrometer for Acuity Measurements and Testing

Abstract

We present the novel instrument combining the Shack-Hartman wavefrontsensor, compensator of low order aberrations and bimorph adaptive mirrorfor high order aberration correction. We have tested the developedinstrument in the clinical environment on human subjects. Themeasurement rate was 77 frames per second. The typical residual error ofcorrection was between 0.1-0.15 microns was achieved. The wavefront canbe reconstructed in form of up to 36 Zernike polynomials. Automatic loworder aberration compensator allows introduction of spherical andastigmatic terms with amplitudes up to +/- 15 D and +/- 6 Dcorrespondingly and accuracy of 0.05 D. An 18 electrode bimorphdeformable mirror corrector makes it possible to model Zernikeaberrations up to the 3-th order + Spherical aberration with RMSamplitudes up to 1 micron. The results of measurements were comparedwith clinical refraction and good correspondence was found.