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Lower order aberrations is a phrase used in wavefront technology to describe 2nd-order Zernike polynomials. It is basically the same as conventional spherical and cylindrical refractive error, which are the types of optical aberrations which are generally fully correctible with corrective lenses. The phrase is used to distinguish these refractive errors from higher order aberrations, which are optical imperfections that are not correctible with spherocylindrical lenses.
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