Note also that we have made assumptions about print size, viewing distance and visual acuity in these calculations. These happen to be the "standard" assumptions most camera makers make when calibrating the depth of field scales on their lenses.
Also, the visual acuity is much greater directly in the middle of what we see (try reading a sign that you are not looking directly at!) The eye resembles a video camera more then a photographic camera.
But, these guides do have very special skills and incredible visual acuity, and a muck photographer will increase his or her efficiency by relying on local knowledge.
Eye fatigue being one of them, not to mention individual visual acuity performance and other such vision associated elements.
This control, often found in the LCH Editor, enables you to concurrently shift the balance among the primary colors. You've got to see this one to fully understand it. There's nothing automatic about it, and it requires your visual acuity and ...
I haven't noticed any particular image degradation caused by filters, but then perhaps I simply lack the highly-refined, well-trained and hawkeyed visual acuity to notice the shocking drop in image sharpness.
The acceptable circle of confusion is influenced by visual acuity, viewing conditions, and the amount by which the image is enlarged.
 See also: Image, Acuity, Stand, Camera, Ground
  
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