This has been bothering me for months now and google isn’t giving me answers. So, how?
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The pupil of our eye limits the direction the light can hit our retina. We can only see light at a very narrow angle… or else yes, it would be a mess. Old school inuit used to make sunglasses out of leather with narrow slits that would block out light in all directions except for a narrow slice for just this reason, as the snow would cast light at their eyes from all directions and blind them (“snow blind”). This would work today in watery or snowy conditions, and is also why polarized sunglasses work so well in these environs.
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