Cats
Below is another odd-eye tortie: a 10 year old tortie/tabby called Debby photographed by
Marjan Boonen in The Netherlands. Since tortie cats' patched colouration is due to
mosaicism, it's possible this has extended to the eyes resulting in two different colours
Occasionally the different colour eyes are due to an eye injury or illness that has damaged the
iris or one eye. In this case the trait cannot be passed on.
DICHROIC (DICHROMATIC) EYES
Partial heterochromia (dichroic eyes) occurs when different amounts of melanocytes, or
melanocytes with different activity levels, are present in distinct areas of one iris. This gives
the “pie slice” or “coloured halo” effects. Dichroic/dichromatic eyes have two colours in one
iris. For example there may be a yellow ring around a green iris. This is considered a fault in
show cats, but can be very attractive.
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