These troughs are deep enough to confine hay and grain but don’t obstruct peripheral vision. Horses can’t see directly in front of their noses, whiskers help with that.

Western Horse Watchers Association
Exposing the Hypocrisy, Lies and Incompetence of the Wild Horse Advocates
These troughs are deep enough to confine hay and grain but don’t obstruct peripheral vision. Horses can’t see directly in front of their noses, whiskers help with that.
