Gypsy, the Equine Encyclopedia, has something to say about equine vision. Like all shetlands, she is always watching, listening and learning.
Horses have two types of vision: Monocular and Binocular. Monocular vision involves only one of a horse’s eyes seeing to one side. This is good for detecting movement but, using Monocular vision, horses cannot see in 3-D.
When looking ahead of himself with both eyes, a horse uses Binocular vision. This helps him see in detail where he is going. This way, horses can see in 3-D which aids in judging depth and distance. Horses have a blind spot 7-10 feet in front of their nose, directly behind them and directly along their sides. Horses also have better night vision than humans do.