Why Do Things Look Blurry Underwater?

The video explains why humans struggle to see underwater due to the similar refractive index of water and the human cornea, which reduces light bending. It describes how light refraction works and the role of the cornea and lens in focusing light. Goggles help by creating an air pocket that restores light bending. Fish, adapted to underwater vision, use their lenses for focusing. Evolutionarily, early fish had difficulty seeing in air, but humans have adapted to air vision over time.

What new insight or understanding did you gain from this video?