What distinguishing feature of Appaloosas is often referred to as a human eye?

The distinguishing feature of Appaloosas that is often referred to as a "human eye" is the sclera. This term describes the white part of the eye that surrounds the iris and pupil. Appaloosas are known for their unique eye appearance, which can feature a prominent sclera that is more visible compared to other horse breeds. This characteristic, along with their distinctive coat patterns, helps to enhance their striking appearance and has contributed to their popularity.

The prominence of the sclera in Appaloosas gives them a more expressive and sometimes striking look, drawing a parallel to human eyes, which can also have a noticeable scleral area. This feature can evoke emotional responses and can be a point of discussion among enthusiasts and breeders.

In contrast, the cornea is the transparent front part of the eye, the iris controls the diameter of the pupil and thus the amount of light that reaches the retina, and the pupil is the opening that allows light to enter the eye. While all these parts are essential to eye function, they do not specifically relate to the unique characteristic associated with Appaloosas.