"aberrations of optical imaging systems" . . . . "aberrations" . . . . "curvature of field" . "visual aberrations" . "optically corrected" . "aberration corrected" . "aberration" . "Ocular aberrations" . . . "unaberrated system" . "Aberrations" . "wavefront aberrations" . "distortions" . "lens aberrations" . "factors" . "aberration content" . "aberrated" . "Optical aberration" . "optical aberration" . . "flaw" . "non-aberrated" . "Optical aberration" . "mirror aberrations" . . "aplanatic point" .