Twa Rogueish E'en

Different Colored Eyes Day

Jul 12

Other Scottish Country Dances for this Day

Today's Musings, History & Folklore

"On Cessnock banks a lassie dwells,
Could I describe her shape and mien;
Our lasses a' she far excels -
An' she has twa sparkling, roguish een! "

~ Robert Burns, The Lass of Cessnock Banks, 1780

Today is a day to celebrate both the diversity of eye colour between individuals and even the difference between individual eyes, a condition known as heterochromia iridum, a variation in the colouration of the iris. One of the most famous pair of "roguish eyes" belongs to the La Gioconda, Leonardo Da Vinci's famous 16th century painting better known as the Mona Lisa. Ironically, although this painting lends its name to the "Mona Lisa effect" (an optical illusion that the subject of a painting follows you with its gaze, despite where you stand) scientists have determined that the Mona Lisa itself is not a legitimate example and that her gaze actually is pointed over the viewer's right shoulder! Should your own "twa rougueish e'en" be of the amber, blue, brown, gray, green, hazel, red, violet, or a mix of colours, we hope that today, they have reason to sparkle! 👀

Twa Rogueish E'en

Today is a day to celebrate different colored eyes - both the diversity of eye colour between individuals and even the difference between individual eyes, a condition known as heterochromia iridum, a difference in coloration of the iris.  

Currently eye color classification groups people with the following colors: Amber, Blue, Brown, Gray, Green, Hazel, Red, and Violet.

The most uncommon eye colors include:

  • Green

  • Violet/Red

  • Amber

  • Hazel

Heterochromia is a genetic trait that, depending on the creature it occurs in, can be due to inbreeding, genetic inheritance or mutation. In some breeds of cats, like the Turkish Angora, heterochromia is a desirable trait that breeders try to maintain.  In humans, heterochromia occurs at a rate of 1 in 6000.


In complete heterochromia, one iris is a different color from the second iris. 


On partial heterochromia or sectoral heterochromia, part of one iris is a different color from the rest of that same iris.

In humans, the pigmentation of the iris varies from light brown to black, depending on the concentration of melanin in the iris pigment epithelium (located on the back of the iris), the melanin content within the iris stroma (located at the front of the iris), and the cellular density of the stroma.The appearance of blue and green, as well as hazel eyes, results from possible Rayleigh scattering of light in the stroma, a phenomenon similar to that which accounts for the blueness of the sky.

For more about the rarest eye colors in humans, click the beautiful heterochromic eyes.

Twa Rogueish E'en
Twa Rogueish E'en

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