What Causes Blue Eyes
A horse's eye color, like its coat color, comes down to pigment. Blue eyes happen where the iris has little or no melanin. In horses this most often shows up alongside white-spotting patterns — such as splashed white, frame overo, or sabino — that also remove pigment from patches of skin and hair. That's why a blue eye is so often paired with a nearby patch of pink, unpigmented skin, rather than being random.
Cremello & Perlino Horses
Horses that are predominantly cream or off-white with pink skin — cremellos and perlinos — carry two copies of the cream dilution gene, which lightens both coat and eye pigment. These horses very commonly have pale, glassy blue eyes as a result, distinct from the "spotting-linked" blue eyes described above.
Wall Eyes & Two-Colored Eyes
A "wall eye" is simply an older term for a blue eye — most common where the surrounding skin and hair are white or lightly pigmented. It's also possible for a horse to have heterochromia: one brown eye and one blue eye, or even a single eye split between the two colors.
Is Blue-Eyed Vision Different?
No — research on equine vision has found no meaningful difference in eyesight, light sensitivity, or eye health between blue and brown eyes. A blue eye is a cosmetic variation, not a functional one, and needs no different care than any other horse's eye.
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