Abstract
To measure directly the wavefront aberration coefficients, we propose to use the multi-order diffractive element fitted with the set of Zernike polynomials. Polynomials of lowest degree describe defocusing (ametropy) and astigmatism. Coefficients of highest degree correspond to the spherical aberration of oblique rays that occurs as a consequence of misalignment of the crystalline lens and foveola, as well as deflection at the periphery of the crystalline lens. Multi-order elements allow several tens of expansions coefficients to be measured simultaneously, which will enable to investigate insufficiently known high-order aberrations for the differentiated diagnostics of eye diseases.
Highlights
Wave aberrations of the eye can be measured using various subjective and objective methods
We propose to use diffractive optics methods for the direct optical measurement of amplitudes of coefficients for the expansion of the individual visual system wavefront in Zernike polynomials [14]
The example suggests that in a wavefront analysing, when it will suffice to measure the modules of expansion coefficients, a phase-only filter may be used to advantage
Summary
Wave aberrations of the eye can be measured using various subjective and objective methods. We propose to use diffractive optics methods for the direct optical measurement of amplitudes of coefficients for the expansion of the individual visual system wavefront in Zernike polynomials [14]. Wavefront aberrations are analysed using a phase spatial filter, with orthogonal circular Zernike polynomials used as a basis of the light field expansion. Note that in this case, not the phase field but the complex amplitude is expanded into the Zernike basis, with the intensity generated in the spatial plane of Fourier-spectrum and proportional to the field expansion coefficients. We are concerned with iterative algorithms for computing the Zernike filter phase and the phase of light field complex amplitude
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