How good is a guinea pig’s eyesight?

By human standards, a guinea pig’s eyesight is fairly good, but because they live in burrows long-term, they adapt poorly to bright light, and prolonged exposure to very bright or flickering environments can easily damage their vision. In addition, because a guinea pig’s eyes are on the sides of its head, it can see a full 360 degrees, with only a blind spot right around the nose. Finally, guinea pigs are nearsighted; their best visual acuity is about 3.0 c/d, roughly equivalent to 300 degrees of human myopia..