The effect is better than expected, for, as the lens is relatively large (larger than the iris itself) and has good coverage, you can see by their own eyes color anything.
The onset you have to, especially if you as a demented patient person like me is * irony *, practice a few times, but a guide is what really facilitated the whole thing: D
All in all I'm really fully satisfied and wish you all a wicked carnival, carnival, carnival or whatever;))