The only thing that may help is stopping the lumigan and eventually you may see some improvement. You can also get the same problem with travatan and xalatan. I suggest you look into SLT laser treatment as a way to reduce the pressure and maybe drop down to just one medication a day hopefully. Then you might be able to use alphagan or trusot/azopt or a beta blocker and avoid the darkening problem.
Michael Kutryb, MD
I was on Lumigan for several years and developed those darkened eyes that you call panda-esque (I call them "RACCOON EYES"). After I stopped Lumigan, the dark patches gradually faded. Apparently Lumigan "stains" the skin tissues, but when you discontinue the eyedrop, the darkened areas fade. You might want to check with your own doctor to see what he or she can suggest.