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Fig. 8. Removing the ß-peak from the GFRKD visual pigment template
optimization allows for a much better fit in both eye types (gray lines;
correlations=0.984, lower eye; 0.968, upper eye). With invertebrate levels of
self-screening (k=0.0067; A,B, black lines) the curves are
indistinguishable from the no screening case (A,B, gray lines). However, these
fits can be improved further by adding vertebrate level self-screening to the
optimization (C,D, black lines); where k= 0.035 µm-1,
and l=50 µm for the lower eye photoreceptors and l=35
µm for the upper eye photoreceptors. Here, self-screening has the effect of
broadening the absorption curve. For the lower eye (C) the half-width
increases to 112.1 nm with the addition of screening, compared to 82.0 nm
without screening. For the upper eye (D) the half-width increases to 111.2 nm
from 82.8 nm. Correspondingly the correlation values increase to 0.991 and
0.980 for the lower and upper eyes, respectively.
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