eli5, how is it that cameras can see clearly underwater whereas human vision gets blurry?

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eli5, how is it that cameras can see clearly underwater whereas human vision gets blurry?

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There is a waterproof piece of glass between the water and the image sensor(or film) called a lens. The human eye does not have a waterproof lens, so the water touches the eye directly. However, when humans wear goggles, they can see much clearer underwater.

Cameras have the advantage of specialized lenses and technology, allowing them to maintain clarity underwater, while our human eyes lack the same adaptations.

I can see pretty clearly underwater. I wear contacts.

Is my perspective underwater less distorted than someone who does not wear contacts?

Our eyes are designed to see in air, based on millions of years of evolution. When we are underwater, the light bends differently when it enters the eye than it does on land, and so it will be blurry when it hits the retina at the back of the eye.

Camera lenses can be designed to work underwater, so they can see clearly in water

Cameras will not see clearly underwater if the (rounded) lens contacts the water. They will only see clearly if a flat lens protector in front of the lens contacts the water.

Human eyes will not see clearly underwater if the (rounded) eye contacts the water. They will only see clearly if wearing goggles (which need to have a flat front surface).

The shifting of the light happens at the interface between materials. Our eyes evolved to account for bending light from air into our eyeballs. As are most cameras. But, if you have a thin, flat surface, light is not refracted.

This is why all goggles always need to be flat. There would be a substantial lensing effect if they weren’t.

Marine anomals presumably see fuzzily, as well, when not in water.