Can a person with Glucoma use Melatonin?

Some studies say that melatonin may increase intraocular pressure and the risk for glaucoma. There is also some evidence that melatonin may actually decrease intraocular pressure in the eye, and it has been suggested as a possible therapy for glaucoma. They don't really know. Either way, you need to be careful while using melatonin and your sore eyes should be reported to your doctor.

from http://www.nlm.nih.gov/medlineplus/druginfo/natural/patient-melatonin.html
It has been theorized that high doses of melatonin may increase intraocular pressure and the risk of glaucoma, age-related maculopathy and myopia, or retinal damage. However, there is preliminary evidence that melatonin may actually decrease intraocular pressure in the eye, and it has been suggested as a possible therapy for glaucoma. Additional study is necessary in this area. Patients with glaucoma taking melatonin should be monitored by a healthcare professional.