Deer have horrible vision. In fact, deer vision is 20/200! For this reason, deer rely more on their sense of smell and hearing. Because the vision of deer is so bad, Deerbusters recommends adding white warning banners to the deer fence. These warning banners for deer fences allow the deer to see what is in front of them better, preventing deer from potentially running into the fence and causing deer damage to the fence. We recommend that you tie one white warning banner on the fence for every 10 feet at a height of 4 feet. Packs contain 50 warning strips in white, at 1 inch x 24 inches.