Researchers tested four yoga poses and found increases in intraocular pressure for both normal and glaucoma patients. Downward facing dog resulted in the highest increase.

Multiple head-down yoga positions may lead glaucoma patients to experience increased eye pressure, according to researchers at the New York Eye and Ear Infirmary of Mount Sinai. 
Glaucoma is the number one cause of irreversible blindness in the United States. And, while increased eye pressure is the leading risk factor, it’s also the only one known to presently respond to treatment. 
The study tested participants—with and without glaucoma—performing the downward facing dog, standing forward bend, plow, and legs up the wall positions. A rise in intraocular pressure, or IOP, was noted in both sets of participants for all four poses, but especially wit