Of cause people can open eyes in the water. But for someone,they may feel uncomfortable. If you want to open your eyes under water, one way is wearing swimming goggles. Another way without swimming goggles is to familiarize yourself with the water environment, with your eyes closed in the water for a while, then slowly open your eyes, it would be better. When you open your eyes in the water body will let you close your eyes and instincts, and just a little more control you'll be able to do it. You should be attention to water quality. If the water is dirty, it can cause eye infections and inflammation..