I think that is simplistic and ther emay be more to the blue eyes of sabinos than we know. Sabino is a complex color pattern and works with other genes to produce its patterns. I think it is very likely that sabino and its cohorts lol can produce blue eyes or parti speckled eyes all by itself. The truth is we don't know for certain yet....to be fair.
The pattern of sabino horses is polygenic - that is, controlled by more than one gene. http://www.horse-genetics.com/sabino...-genetics.html
"Blue eyes may sometimes occur in sabino horses, but are not considered to be characteristic of the type. Certain lines of horses exhibit blue eyes, such as the Khemosabi line in Arabians, though often only one blue eye is present. Probably blue eyes is linked to sabino in these lines, being caused by a separate gene that is often inherited with the sabino gene. " http://www.horse-genetics.com/sabino-horses.html
More about cream and albino in horses.
Cream horses are sometimes called pseudo-albinos. In other animals (including humans) there are recessive alleles at the C locus that cause true albinism. Individuals homozygous for these alleles lack pigment in the hair, skin and eyes. Their eyes and skin are pink (due to the effect of the blood vessels beneath the surface) and albinism is often accompanied by various congenital defects. No true albino horses have ever been observed and presumably they are inviable (i.e. Die in utero). The author also notes, from experience, that people often refer to cream horses as being white, although this is not the case. cream horses