Figure 6From: Variability of wavefront aberration measurements in small pupil sizes using a clinical Shack-Hartmann aberrometer Signal-to-noise ratio for individual Zernike coefficients. Signal-to-noise (S/N) ratio in the standard pyramidical layout of Zernike expansion coefficients for one subject (OL) as calculated by the two methods. Green colours show high S/N ratio, red colours show low S/N ratio.Back to article page