I had very dark brown eyes until I got Pink Eye in December. After using the drops my eyes turned different colors. Sometimes they are green and sometimes they are brownish-green. I wish I had my brown eyes back.
That should not happen.
Are you sure you just didn’t start looking at your eyes more, subsequent to your conjunctivitis? Perceived iris coloration will, of course, change with your attire and environmental conditions.
What does your optometrist or ophthalmologist have to say about the sudden iris color change?