Chlorine hurts more because it disrupts the eye’s natural tear membrane. In some cases, chlorine can also dehydrate the cornea, leading to cloudy, distorted vision for a short time. [1] X Research source
The eyes are naturally covered with a salty fluid (you are probably aware of this if you’ve ever tasted your own tears). However, the average salt content of the ocean is usually about three to four times more salty, leading to the imbalance that dehydrates your eyes. [2] X Research source
If you must wear contacts underwater, use single-use disposable contacts and discard them after you swim. This way, you won’t need to carefully disinfect them. [4] X Research source
In a pinch, you can also splash your eyes with cool, clean fresh water like you’d get from a bottle or the tap.
If you’re wearing contacts, don’t forget to take them off before you get in the water.
If squinting is too painful, you may be swimming in eye-irritating water (or may just naturally have sensitive eyes). Try the “controlled environment” step at the end of this section.
Some people find it easier to open their eyes underwater if they look upward. Try experimenting with pointing your eyes in different directions to find a position that feels best for you.
When the stinging goes away, gradually open your eyes again. Repeat this pattern as you swim underwater to keep the pain under control.
Fill a bowl or sink with clean, clear, warm (not hot) water from the tap. Lower your face into the water with your eyes closed. It should feel nice. If it’s too hot or cold, adjust the temperature. With your face in the water, gradually open your eyes, squinting at first and then opening them fully. Close your eyes again as soon as they start to sting. Repeat a few times until you can open your eyes confidently before testing your skills in the pool, at the beach, etc.
