If you would have read what was stated earlier

"Latisse is actually Lumigan, which is a glaucoma medication.  It was found that the eyelashes of people using it were significantly longer and fuller after a short period of use.  The discoloration of the iris actually is a side effect of using it as a glaucoma medication, where you are dispensing drops directly into your eye, and it can change your eye color to brown permanently.  Latisse was born out of the side effect finding and it is applied very lightly to the lash line so the chances of iris discoloration is slim."