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The fovea comprises less than 1% of retinal size but takes up over 50% of the visual cortex in the brain.
Spherical "abberation" is not a problem in the eye because the retina, (analogous to film in a camera), is hemi-spherical, (unlike flat film)
If the vertical slit in cat's eyes worked like a pin-hole camera, without a lens, it would increase the horizontal resolution, but as there is a lens it shouldn't make much difference.
I think males with heavy brows will have their field of view restricted by them.