What Are Eyeballs Made Of?

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Eyeballs are unique organs, providing many animals with the ability to interpret the light waves in the world around them, but what are these squishy parts made of?

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Sources:

https://books.google.com/books?id=UPU...
https://thesis.library.caltech.edu/97...
https://www.sciencedirect.com/topics/...
https://www.jci.org/articles/view/107...
https://nei.nih.gov/health/floaters/f...
https://www.healthline.com/human-body...
http://www.aclm.org.uk/index.php?url=...
https://www.healthline.com/human-body...

Images:

https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
http://www.thinkstockphotos.com/image...