option of colour inversion in real exam - dr2015

[ArchivalUser]

I gave a practice session at prometric yesterday to be familiar with envronment on test day.
i saw there is a new addition of colour inversion option on test screen. it seems to help focusing on white letters on black background.

my questions is i dont see that option on uw. so is it that usmle world has not updated software as per real exam or is it that i have to download some new software

[ArchivalUser]

i just read on usmle website ,that the colour inversion is restricted to practice sessions as of now. it will roll out once they get enough feedbacks i guess.