Fig 4. Effect of visual blur on detection in the four retinal quadrants.
(A) Acuity difference between clear and blurred targets. (B) Ratio in MAD between blurred and clear images (Rx = MADblur/MADclear) as a function of retinal location. Blur has only a slight effect on detection acuity in the vertical meridian. Hence, the difference of resolution across foci is unequal at isoeccentric locations of the visual field. In this and following figures, error bars represent one standard error of the mean. Note that ns stands for not significant. TEMP, temporal; NAS, nasal; SUP, superior; INF, inferior.