eli5, how is it that cameras can see clearly underwater whereas human vision gets blurry?
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Whenever light passes from one medium to another, it gets distorted. Going from air to water causes warps and twists to light at the surface. Other mediums do other wierdo stuff.
Our eyes are specialized at handling light as it transitions from air to lens to eyeball. If light passes directly from water to lens, that messes things up. If we wear goggles, that air pocket around our eyes preserves the air-lens-eyeball track that our lenses are good at.
Fish don’t need goggles to see underwater because their lenses are specialized for their environment. They would need water-filled goggles to see in air, though.
Cameras are designed to work in air, and underwater cameras just keep the same design with a built-in goggle-like interface since they need to be waterproof anyway to keep the electronics working.
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