Cryotherapy or hypothermia has proven ideal for the treatment of many systemic conditions; water flowing directly over closed eyes produces reduction in the internal pressure of the eyes, the results are the same, but of course, nothing invasive.
Some studies related:
Treatment of Neovascular Glaucoma with Transscleral Panretinal Cryotherapy
Transscleral panretinal cryotherapy was used to treat six eyes with neovascular glaucoma. The media of each involved eye were sufficiently cloudy at the time of treatment to prevent adequate panretinal photocoagulation. A checkerboard pattern of eight 2.5-mm cryotherapy applications was placed in each quadrant. Five of the eyes were also treated with 180° of cyclocryotherapy. Within 72 hours of treatment, the intraocular pressure in each eye returned to a controllable level. The iris neovascularization in each eye regressed or totally disappeared within six weeks.
A retrospective analysis of thirty-one eyes in thirty patients with neovascular glaucoma (NVG) associated with proliferative diabetic retinopathy or venous occlusive disease was performed. Eyes treated with transconjunctival peripheral panretinal cryotherapy alone, or in combination with limited cyclocryotherapy had improvement or stabilization of visual acuity in 55%, reduction of intraocular pressure in 55%, and stabilization or regression of iris neovascularization in 70% of eyes at 12-14 months post-treatment. Transconjunctival peripheral panretinal cryotherapy alone, or in combination with limited cyclocryotherapy is recommended in the treatment of eyes with NVG and media opacities precluding photocoagulation therapy, or in eyes unresponsive to previous photocoagulation therapy.