When were coloured cats eyes introduced?

Coloured cat eyes, particularly in breeds like the Siamese and Burmese, were introduced in the late 19th century as part of selective breeding efforts. The Siamese breed, recognized for its striking blue eyes, became popular in the late 1800s. Over time, other breeds were developed to exhibit various eye colors, including green, amber, and copper, as breeders sought to enhance the aesthetic appeal of cats.