Zernike phase spatial filter for measuring the aberrations

Article Russian OPEN
Svetlana N. Khonina ; Victor V. Kotlyar ; Dmitriy V. Kirsh (2015)
  • Publisher: Федеральное государственное автономное образовательное учреждение высшего образования «Самарский национальный исследовательский университет имени академика С.П. Королёва» (Самарский университет)
  • Journal: Journal of Biomedical Photonics & Engineering
  • Subject: wavefront aberrations, eye optical system, Zernike polynomials, mul^order diffractive elements, expansion coefficients
    arxiv: Physics::Optics | Astrophysics::Instrumentation and Methods for Astrophysics
    mesheuropmc: eye diseases | sense organs

To measure directly the wavefront aberration coefficients, we propose to use the multi8order 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. Mul^order elements allow several tens of expansion coefficients to be measured simultaneously, which will enable to investigate insufficiently known high8order aberrations for the differentiated diagnostics of eye diseases.
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