After retinal detachment eye colour has now changed, is that normal?

Many causes: The eye color can change from a cloudy cornea, from corneal swelling after surgery or from iris color change. Iris color is a function of the amount of pigment, blood and nerve supply. Trauma and inflammation, injury and surgery and diseases that damage or diminish nerve supply can cause iris color to change. Pigment can be lost during surgery and make the iris color lighter.