- The Evolution of Eyes -
Eyes seem pretty complex, so complex that it is crazy to think they evolved by natural processes, but the closer you look, the simpler it gets.
Now I know I already made a video about eyes, go check that out if you want, but that was about how it works, not about how it came to be that way.
So, what was the first eye? Where do you start in making such a complex organ? Well, the answer is light sensitive cells. That's it. Organisms would use these light sensitive cells to detect whether they were in the light, or in the dark, useful for locating algae that would live near the surface.
And over time, natural selection favored small pits around these cells. What this allowed was for the organism to detect the direction of the light, which made finding the surface much easier.
The deeper the pit, the better the eye, which led to the pit closing up to have just a small opening at the front. This allowed for a much better sense of direction and possibly even for a faint image. This eye works much like the camera obscura, letting a small amount of light in, projecting an upside down image onto the back wall.
Eventually, transparent cells built up over the pin hole, closing it off from debris. This allowed the eye to fill up with its own fluid, making it more efficient.
This transparent covering split over time, and the bottom layer eventually evolved into a rudimentary lens. Lenses are great because they allow for a wider, crisper image so that the organism could actually see what type of predator they were up against. Oh, and by the way, the brain takes care of flipping the image back to normal.
Further adaptations would include cones for color vision, iris for the opening and closing of the pupil, and much more. To learn more about how the eye works and how different animals have different adaptations, check out my other video on animal vision super powers.
So now you know the fascinating story of the creation of the eye by natural selection. I think they work pretty well if you ask me.
Hey guys thanks for watching this quick video. Sorry, it's been a while, I was busy with school and doing summer things. I was also kinda lazy and didn't have a video idea. Speaking of things I had no idea, I had no idea my Omnitrix video was gonna get over 7 thousand views! Thank you all who watched and shared it and liked it. Well, thanks for watching this video, if you want more why not check out my other videos, and subscribe for even more in the future, have a wonderful day.
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