You could have at least Google searched it before attempting a gotcha, there are three methods. One doesn’t actually change the color, but the other two do.
a brown eye tortured into become blue
Your English rather poor, comrade. Better practice front of mirror more times.
If you’re born Vladimir, but you move to the West where no-one knows it, and you introduce yourself as Robert and everyone calls you Robert, are you not then Robert?
Gender is not in your DNA silly. That’s the whole “gender is different from sex” that’s the scientific consensus. You said you rely on science, yet now you argue your brainfarts are more valid than consensus of the entire scientific community?