My cats eye please help

What is going on  with my cats right eye. He's 3 indoor only. No discharge he's eating, playing and acting normal. I can't go to my vet right now so would like to know what this could be and how to treat it till I can get to the vet  

Hello.  As you know, it is extremely abnormal for the iris to change colour in a human, and in that respect the same applies to cats.  I can't really tell over the internet, but there are marks / discolouration of or over the iris, the coloured portion of the eye, in what's known as the anterior chamber.  High on my differentials ('possibilities') list would be cancer eg of the uveal tract, so it could be very important to get this seen by a vet or opthalmologist.

Other differentials might include a bleed or parasites in the eye, either of which would also be seious.