No, grinding teeth can not cause blurred vision. Teethe grinding is involuntary clenching, grinding and gnashing of the teeth. It most happens at night but sometimes it will also happen during the day. It is a physical expression of stress. If people are mad, upset and hard to focus on a particular task, they may grind teeth. Of course, there are also some other reasons in grinding teeth, for example, Incorrect tooth alignment, including fillings that are too 'high', Drug misuse (particularly amphetamines) and Eruption of teeth (babies and children). It has nothing to do with blurred vision.