PERIPHERAL: Outer boundary or outlying surroundings.
Did you know that animals with horizontal and rectangular slits for pupils are most often prey animals? Now, before you feel too sorry for them, just know that they have amazing field vision. In fact, their peripheral vision is TEN TIMES that of predators with circular pupils. Apparently, they have a 320 degree view, without any blind spots. Alas, anyone who’s ever tried to catch a rogue goat has learned this the hard way!