I am reading an interesting article: TREATMENT OF GLAUCOMA WITH CHINESE HERBS by Subhuti Dharmananda, Ph.D., Director, Institute for Traditional Medicine, Portland, Oregon
The article quotes the recent compendium English-Chinese Encyclopedia of Practical Traditional Chinese Medicine (4), in which Volume 17 is devoted to ophthalmology. As to cause of open-angle glaucoma, it says:
Emotional depression of a person may cause stagnation of liver qi that will turn into fire. When the fire goes upward to attack the eyes, the disease occurs. Or, if a person suffers from retention of dampness due to hypofunction of the spleen, phlegm will originate from the retention and form phlegm stagnation which will further convert into fire. When the fire moves upward to attack the eye, the disease is caused. Besides, deficiency of the liver and kidney, a condition called consumption of primordial yin, will result in asthenic fire, and attack of the eye by the fire will lead to the disease.