Remembering the famous Mr. Ed from reruns of the 1960s television program, Rebecca Berry became curious about horses’ eyesight. She says horses rarely have issues with their eyes focusing light, which is why they don’t need glasses, contacts or a powerful light source.
Source: Horse Network, May 17, 2022. Link. Horses are thought to have 20/30 to 20/60 vision. This correlates to them seeing something 20 feet away that we, with 20/20 vision can see from 30 or 60 feet away.