People don't have purple eyes. Stop spreading this Elizabeth Taylor bullshit. She had blue eyes, and this can be easily verified by googling.
Marchesani syndrome has nothing to do with purple. In the human body, there are no pigments that make the eyes purple.
I don’t argue that it is possible for someone under certain lighting conditions to look like this, but this has nothing to do with the natural color of the eyes in just a play of light.)
I do not know how to explain this, but I have often met purple eyes in elderly people who are already over seventy.
It happens that everything is written correctly above. There is also a theory about the occurrence of lilac eyes - albinism disease. This disease is characterized by the absence of melanin in the body. Albinos usually have red red eyes, but there are times when blue collagen is reflected in their eyes a little stronger than usual, giving the eyes a purple tint.
Information from here: http://www.uznayvse.ru/interesting -facts / samyiy-redkiy-tsvet-glaz-v-mire.html
Well, actually, it happens. But it is extremely rare and is accompanied by a genetic mutation. It is estimated that 7% of people with Markezani syndrome have purple eyes. Also, this pathology is characterized by short stature, brachydactyly (shortening of the hand) and the curl of the lens.
The iris consists of the anterior - mesodermal, and posterior - ectodermal layers. The back layer is dark in color in all except albinos. This is due to the fact that they lack melanin not only in the mesodermal, but also in the ectodermal layer of the iris, therefore, the color of the eyes is determined by the color of blood in the transparent vessels of the iris. In some cases, the red color, mixing with the blue color of the stroma (the main substance of the cornea), gives purple. However, such deviations are also extremely rare.