Example image of eyePlorer eyePlorer map for 'Optical aberration': Paraxial approximation Caustic (optics) Ray (optics) Reflection (physics) Refraction Monochrome Chromatic aberration Dispersion (optics) Lens (optics) Refractive index Wavelength Curvature Cardinal point (optics) Carl Friedrich Gauss Focal length James Clerk Maxwell Pencil beam Aperture Robert Blair Allvar Gullstrand Isaac Newton Arthur König Coma (optics) Distortion (optics) George Biddell Airy Zernike polynomials Frits Zernike Orthogonality Coefficient Linear independence Even and odd functions Angle Azimuth Integer Radian Normalization Fourier Trigonometric functions Gradient Low-pass filter Space Spatial frequency Turbulence Wave propagation Fractal Singular value decomposition Diffraction Numerical aperture Joseph Petzval Philipp Ludwig von Seidel