When in shed and eyes are blue they are pretty close to no sight.
Your bp see's you thru heat and vibration.
Heck even when there eyes are clear they have very poor eyesight.

" How can they feel vibrations thru air" ????? Ummm they feel it thru ground.
My bp knows it when I walk in the room from the slight vibrations he feels from my feet on the carpet.

I do hope most don't think they hunt and react from what they "see"
Their best sight is thru their tongue