Sextus Empiricus Pyrrhoniae Hypotyposes 1.14.44

[44] Moreover, the differences found in the most important parts of the body, and especially in those of which the natural function is judging and perceiving, are capable of producing a vast deal of divergence in the sense-impressions owing to the variety in the animals. Thus, sufferers from jaundice declare that objects which seem to us white are yellow, while those whose eyes are bloodshot call them blood-red. Since, then, some animals also have eyes which are yellow, others bloodshot, others albino, others of other colours, they probably, I suppose, have different perceptions of colour.