You have to have melanocytes in your irises to have any chance of change. Thus, green or hazel eyes only. People with blue eyes who do not have melanocytes will not have any chance of eye color change.
And to be honest, I've sold thousands of Latisse prescriptions and not seen one change in eye color. The only eye color change ever came with Lumigan, which is what Latisse is derived from and is used directly in the eye for glaucoma, and so the same FDA warnings came with the Latisse packaging.