Does an optimum size of the eyes help in proper vision so it shouldnt be too big or small?
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The size of the opening that lets light into your eye affects how much detail you can see. If you have a very large eye, you can see more details, especially if they’re far away. But giant eyes are also a weakness because they’re fragile and they take energy to grow and keep alive.
So the best size for your eye kind of depends on what you need to see. For the most part, all animals care about seeing things that are about the size of the things they eat and the things that will eat them. Mice need to see more small things than elephants do. So a mouse needs eyes that look bigger its head than an elephant.
Eyes see the world kinda like cameras – we have sensors that are somewhat like pixels, and just like cameras they have a minimal resolution that they need to be useful, and on the contrary having an insanely high resolution doesn’t really create that much of a difference after certain point. That resolution is dependent on how many sensors can be fit in your eyeball, so small animals have higher eyeballs compared to their body so that they could fit in that minimum, meanwhile larger animals rarely go much beyond that minimum so they don’t need bigger eyes
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