The ideal eye is  shaped rather like a plump almond. With shortening of the head there is a tendency toward a prominent, round eye. This tendency is checked by the fact that such an eye would be easily injured by cold, drying wind, dust, sun, and the very headfall needed to protect the eyes. An Apso with prominent eyes would certainly be blind at a young age in the Himalayan environment. Recent visitors to the region report seeing not one Apso with a round bulging eye. Dark pigment is less susceptible to solar damage.  The almond eye is well supported laterally by a prominent bony infraorbital ridge.  It is this ridge that gives the eye its almond shape by lifting and supporting the eye and lower lid in its lateral aspect.
Although the 1901 standard says, "Ears set on low", I believe that this was meant to distinguish it from a prick ear.  All the early imports had rather small high set ears, set only slightly below the crown of the head.The ears are quite mobile and tend to lift the heavy headfall away from the orifice when the dog is alerted. This is the very best ear he could have for protection from weather, dust or injury. A large, low set spaniel or hound type ear would freeze easily, with its weight of hair would obstruct the keen hearing necessary for this breed, and is susceptible to parasites and infection.