Animal world
What is special about fish eyes to make them see clearly underwater?
The aspherical lens at the fisheye helps to compensate for the lack of refraction and better focus the image on the fovea - the area of clear vision.
Fovea
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Articles about Fovea
2 published items.
Medicine - Health
Why do squinting help us see better?
The squint action changes the shape of the passing light, creating a sharp image on the retina.