Table 1.

Common Types of Aberration in OCT

Group	Label	Aberrations	Zernike Polynomials
I	1	Astigmatism	$z_2^{-2}=\sqrt{6}{\rho }_k^{2}sin2{\theta }_k$
	2	Astigmatism	$z_2^2=\sqrt{6}{\rho }_k^{2}cos2{\theta }_k$
	3	Defocus	$z_2^0=\sqrt{3}(2{\rho }_k^2-1)$
II	4	Coma	$z_3^{-1}=\sqrt{8}(3{\rho }_k^3-{\rho }_k)sin{\theta }_k$
	5	Coma	$z_3^1=\sqrt{8}(3{\rho }_k^3-{\rho }_k)cos{\theta }_k$
III	6	Spherical	$z_4^0=\sqrt{5}(6{\rho }_k^4-6{\rho }_k^2+1)$
	7	Defocus	$z_2^0=\sqrt{3}(2{\rho }_k^2-1)$