Sky Eyes
Bilateral dorsomedial strabismus (sky eyes) is a condition in which the eyes are abnormally rotated upward and backward.
The eyes appear to be tilted in such a way that the horse is continually looking upward, to a point on the forehead/forelock, just ahead of the ears. This results in the pupil appearing to be tilted back toward the ear.
Blue eyes in horses have a number of possible causes.
Distinguishing a horse carrying the dun gene from individuals exhibiting some dun characteristics can pose a problem.