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Table 3 Zernike’s polynomials up to the 4th order in cases and controls

From: A randomized, fellow eye, comparison of keratometry, aberrometry, tear film, axial length and the anterior chamber depth after eye rubbing in non-keratoconic eyes

Zernike’s
Polynomial
Cases Controls
P values comparing pre vs. post rubbing P values comparing pre vs. post rubbing
WFA front WFA back WFA cornea WFA front WFA back WFA cornea
Z0 0 (Piston) 0.309 0.417 0.220 0.440 0.432 0.220
Z1 1 (Tilt (Prism)) 0.164 0.306 0.215 0.605 0.567 0.552
Z−1 1 (Tilt (Prism)) 0.257 0.336 0.229 0.339 0.275 0.401
Z2 2 (Astigmatism) 0.001 0.317 0.003 0.678 0.244 0.515
Z0 2 (Defocus) 0.315 0.351 0.282 0.453 0.349 0.560
Z−2 2 (Astigmatism) 0.902 0.824 0.934 0.720 0.692 0.630
Z3 3 (Trefoil) 0.772 0.238 0.973 0.699 0.653 0.586
Z1 3 (Horizontal Coma) 0.070 0.273 0.088 0.282 0.365 0.253
Z−1 3 (Vertical Coma) 0.344 0.166 0.308 0.520 0.641 0.496
Z−3 3 (Trefoil) 0.813 0.909 0.857 0.869 0.566 0.754
Z4 4 (Quadrafoil) 0.157 0.861 0.176 0.342 0.853 0.399
Z2 4 (Secondary Astigmatism) 0.193 0.404 0.226 0.257 0.132 0.357
Z0 4 (Spherical aberration) 0.230 0.071 0.191 0.716 0.845 0.689
Z−2 4 (Secondary Astigmatism) 0.430 0.809 0.467 0.591 0.848 0.565
Z−4 4 (Quadrafoil) 0.828 0.057 0.530 0.774 0.594 0.840
  1. Abbreviation: WFA = wavefront aberration