The answer is absolutely yes. It's really necessary for people to wear swim goggles for the sake of our eyes. The most essential reason is avoiding infections. There are some bacteria getting into your eyes and irritates the eyes while swimming, goggles is a useful way to prevent these from our eyes. The other reason is, while you swimming under water, this visibility can be one of the trouble. It is hard to see clear let alone the reflection of the sun off the water. Hence, it's necessary to wear goggles, which can block sunlight and can increase line of sight with a low profile so you can experience less resistance. Accordingly, you'd better wear swim goggles while swimming.