Scatter plots of the relationship between each “important factor” that can predict either fixation stability or visual acuity. These factors are: fixation stability (log-transformed BCEA values were used here), visual acuity (logMAR), error magnitude (log-transformed), amplitude of microsaccades (log-transformed), amplitude of slow drifts (log-transformed) and frequency of microsaccades. The correlation coefficients for each pair of variables are given in the lower half of the figure. All correlation coefficients are significant at the p ≤ 0.05 level except for the pairs between frequency of microsaccades and acuity, error magnitude, amplitude of microsaccades, and amplitude of slow drifts (correlation coefficients shown in light gray).