After being diagnosed with glaucoma I did a fair amount reading about that condition. My conclusion is that aside from some specific cases (head/eye injury) nobody really knows what causes it, there are probably multiple reasons, it could be a downstream effect from other health problems, and there just isn't a lot of research to sort it out.
Cynically, I feel like there is a lot of money being made just by treating eye disorders the same way its been done for decades. For example, right now, the main treatment I use for glaucoma is eye drops, which is the same treatment given to my grandmother when she was diagnosed in the 1960s. And those drops are not covered by insurance, rather expensive, and I have to take them every day forever, along with twice a year eye exams and visual field tests.
Cynically, I feel like there is a lot of money being made just by treating eye disorders the same way its been done for decades. For example, right now, the main treatment I use for glaucoma is eye drops, which is the same treatment given to my grandmother when she was diagnosed in the 1960s. And those drops are not covered by insurance, rather expensive, and I have to take them every day forever, along with twice a year eye exams and visual field tests.