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Feb 16, 2023 at 2:55 comment added Loren Pechtel @bdsl Yup, mask/goggles are basically corrective eyewear that since everyone needs the same prescription for and thus are stock rather than from an optometrist.
Feb 14, 2023 at 18:23 history edited Neil_UK CC BY-SA 4.0
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Feb 14, 2023 at 18:16 comment added Neil_UK @bdsl The air inside the mask is the dielectric constant that the eye has evolved to work with. Well, approximately at least. I'd imagine the refractive index of the gas increases slightly with pressure, but not to the extent that increases by replacing it with water.
Feb 14, 2023 at 18:11 comment added bdsl So the air inside the googles / mask is effectively another lens element between the eyes and the water. Importantly the rear of the air is shaped with a curve that conforms to the eye, and the front of the air is shaped with a flat or near-flat surface that conforms to the plastic surface.
Feb 14, 2023 at 15:31 history edited Neil_UK CC BY-SA 4.0
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Feb 14, 2023 at 15:25 history edited Neil_UK CC BY-SA 4.0
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S Feb 14, 2023 at 12:16 review First answers
Feb 14, 2023 at 14:32
S Feb 14, 2023 at 12:16 history answered Neil_UK CC BY-SA 4.0