I wear glasses and dive too. Our brain looks at ALL the light images that shine on our eye's retina and gets interpreted as blurry. Sometimes by focusing that light image to a smaller part of the retina we can see the image clearer and that's how glasses work to better focus. As diver's, we can trick our brain to focus on a smaller part of the retina image underwater by making a tiny hole with our curled up index finger. Tuck your index finger in a tight curl leaving only a small hole opening about the size of a pencil lead. Hold it tight with the your thumb on top. You can hold this up to your mask lens underwater or eye and you'll still be able to clearly read your gauge or computer underwater.
You can also test this right now if your eye won't clearly focus on something without glasses at or above your screen. Take off your glasses, tuck your index finger and read the words. Even though the amount of area you can read is tiny, you can still clearly see the letters as you move down the sentence or see across the room to read something. It's not a substitute for a prescription mask or plastic inserts that are available, but it's a nice trick for a backup plan when you need to see something clearly and quickly,,,,,Even in the pool or underwater.
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