The percentages are given in ranges because results are different in different areas, partly because of the different genes found in the cat population. Where a cat is classed as deaf, the deafness may affect one or both ears. Siamese blue eyes lack a reflective tapetum and give red-eye with flash cameras. Random matings can mean that this gene sometimes appears in non Oriental-looking cats which have colorpoint cats in their ancestry. Albino cats are also white.
True albinism causes pinkish eyes, but some albinos or partial albinos have pale blue eyes.
There are too few albino cats studied to draw firm conclusions, but this mutation is not necessarily linked with deafness. There is also a gene for blue eyes which is inherited separately from coat color. This is the gene responsible for the Ojos Azules breed. It's only possible to tell that a cat has this particular gene if the cat is non-white and has blue eyes. Genes for blue eyes independent of coat color may be more common than previously realised.