Heterochromia
Similar events may happen in other tissues, and sometimes result in visible tissue differences. However, the condition is most easily seen in the iris of the eye. The terms Hetrochromia iridis (= different colour of the iris), Heterochromia iridum (plural form) and Heterochromia iridium (a mistake in Latin grammar) are variously used when it is the eye colour which is specifically mentioned.