Figure 4.

Theoretical through-focus retinal image quality for various amounts of SA with (dashed line, α = 0.3 mm⁻²) and without (thick solid line, α = 0 mm⁻²) pupil transmission apodization. The thin solid line refers to apodization due to the Stiles-Crawford effect (α = 0.05 mm⁻²). (a–c) refer to SA values of 0, +0.2, and −0.2 μm for a 4-mm pupil, respectively. (d) shows the through-focus visual benefit of apodization (α = 0.3 mm⁻²) for 0 μm (solid gray line), +0.2 μm (large dashed line), and −0.2 μm (dotted line) of SA. At each target vergence, positive values refer to an improvement in retinal image quality due to apodization whereas negative values refer to a degradation.