Not being able to focus clearly on something != Not being able to see something completely. Maybe my wording was a bit off there. They see something there, it's

Not being able to focus clearly on something != Not being able to see something completely. Maybe my wording was a bit off there. They see something there, it's just very blurry to them. It's measurable directly from lens and eye dimensions, and from pupil reactions, the way opticians measure people for their prescription. I know you're arguing in bad faith at this point, but just do an experiment, put your face 5cm close to a monitor, wave the mouse around. That's what your cat sees at 15cm away.