Blue eyes are generally associated with pinto patterns, particularly tobiano, though their inheritance is not entirely understood. Champagne horses will have green or amber eyes. Cremello and pearl horses will have lighter eyes. As far as we know, horses do not have genes that specifically dictate eye colour. Their eye colour is usually influenced by their coat patterns and dilutes, however it is possible there is a gene for eye colour that has not yet been isolated. If there is a specific gene for blue eyes, there is a good chance it is physically near a pinto patterning gene and the mutation for blue eyes occurred in a pinto so now that mutation is often inherited together with the pinto pattern because of their close proximity on the chromosome.