NO, this choice can’t be done before. It is not known which colour your eye will be after the procedure!
VIP EYE LASER method stimulates the cells that give the colour of black-brown to iris in our pupils and after the dark-colored cells falls and naturally the colours of blue, hazel, grey and green that exist in your genetic emerge. In other words, it is your pigment cells laying below that define the colour, thereby, it is not known which colour will your eyes be before laser.
(**it is not certain, however, our observations show that eyes who consist of dark brown, intense pigment have the potential of turning into more grey or hazel, eyes who have dark green, light color pigment have the potential of turning into blue or green.)
Color change in the eye varies depending upon the resistance that current coloured pigments.