Another possibility is the use of cannabinoids. You live in a state with some experience with this. Some links:
Is Marijuana an Effective Treatment for Glaucoma? - Medical Marijuana Pros and Cons - ProCon.org
Medical Marijuana: Turning Over a New Leaf in Glaucoma Treatment?
Glaucoma

There are many strains of cannabis, some with very little THC. Most medical marijuana users use a vaporiser or edibles to take their medicine, neither of which is damaging to the lungs. A good medical marijuana dispenser should be able to advise you on what varieties have proven more effective for glaucoma and with the least undesirable side effects.