It seems that to do Bikram Yoga with contact lens is OK as it is not fierce. But it's not true. It is not OK to do Bikram Yoga with contacts. Bikram yoga is taken under the room temperature of 38℃-40℃, which is higher than average temperature and human's normal body temperature. Under that condition, the body will evaporate some water and the eyes will be comparatively dry, so that wearing contact lenses will no be comfortable. On the other hand, contacts lenses are directly touching cornea and relevant to optic nerve. When doing yoga, there are some moves that you have to stand upside down. At the time of doing these moves, the blood will flow to you face and have effect on optic nerves. In case of wearing contacts, the blood will be pressed by lenses and the pressure will be transit to the nerve. That will be harmful. Staring is also one of the moves of yoga. When you wear contacts, it will impact you staring and focusing. So that, don't wear contacts while do Bikram Yoga.