something on google that i found on wild pig eyesight...
Wild pig experts rejoice, boar hunting guides savor the sweetness of victory. Boar cannot see as well as humans! Or Betsy the lead cow of your herd. That should make you feel even better.
As long as you keep in mind that we are talking about symbols or objects less than about one inch in size. Pigs can not tell the difference between a circle and a square when the size of the symbol is less than an inch! Humans, cows and deer can. Woooooohhhhhoooooooooo!
Scientific research on laboratory pigs has clearly established that the eyesight of pigs – domestic or wild – is good although not as good as that of an eagle or Betsy the cow.
However, it is good enough to let them recognize large objects near or far. Wild pigs are more hampered by their relative closeness to the ground and by their inability to lift their head up high to peer over tall grass or other growth than by their eyesight. That is exactly the reason why your chances of surprising a boar in tall grass or undergrowth are actually relatively good – provided he did not hear you are catch a whiff of your human smell.
When it comes to eyesight of boar I take solace in a quote from 'Texasboar', a website I have cited before. There I read:
“Their (i.e. the wild pigs) eye sight is severely under estimated, according to Universities who have studied them. Others who have raised them tend to agree with this opinion also, as do I.
I, myself can contribute to this. At over 100 yards my hogs can distinguish not only a human figure, but have eyesight that is capable of distinguishing a "human friend" or "STRANGER" from facial characteristics and build.
They will come running upon my father's or my recognition, to be fed. They will leave running when a stranger approaches. This recognition process has been observed consistently at 100 + yards. They can easily see me coming at 250 + yards. They may not run, they may not pay attention, but don't think they can't see you. Hog are at a disadvantage when it comes to sight mainly because of their low profile. They can't raise their heads high like a deer or other wild animals to see over grass or vegetation.”