National Different Coloured Eyes Day is an annual event that is celebrated on July 12 in several countries around the world. This international event aims to raise awareness and appreciation of heterochromia iridum – the rare condition in which a person has two different coloured eyes. National Different Coloured Eyes Day 2025 falls on Saturday, July 12. Heterochromia is a variation in colouration most often used to describe colour differences of the iris, but can also be applied to colour variation of hair or skin. National Different Colored Eyes Day: Meet the Celebrities With Different-Coloured Eyes To Highlight the Prominence of Heterochromia.

Heterochromia of the eye is called heterochromia iridum, which is heterochromia between the two eyes, or heterochromia iridis, which is heterochromia within one eye. It can be complete, sectoral, or central. In complete heterochromia, one iris is a different colour from the other. In sectoral heterochromia, part of one iris is a different colour from its remainder. In central heterochromia, there is a ring around the pupil or possibly spikes of different colours radiating from the pupil.

National Different Coloured Eyes Day 2025 Date

National Different Coloured Eyes Day 2025 falls on Saturday, July 12.

National Different Coloured Eyes Day Significance

National Different Coloured Eyes Day serves as a perfect opportunity to educate people and raise awareness about the types of heterochromia. Though multiple causes have been posited, the scientific consensus is that a lack of genetic diversity is the primary reason behind heterochromia, at least in domestic animals. This is due to a mutation of the genes that determine melanin distribution at the 8-HTP pathway, which usually only becomes corrupted due to chromosomal homogeneity.

(The above story first appeared on LatestLY on Jul 12, 2025 07:10 AM IST. For more news and updates on politics, world, sports, entertainment and lifestyle, log on to our website latestly.com).