Why Isn’t Every Pupil Round?

Get a lifetime or yearly membership to Nebula here: https://go.nebula.tv/realscience Watch this video ad-free on Nebula: https://nebula.tv/videos/realscience-why-arent-all-pupils-round Patreon: (https://www.patreon.com/realscience) Instagram: (https://www.instagram.com/stephaniesammann) Images Courtesy of Getty Images Thanks to Dr. Dan Nilsson and Dr. Marty Banks for their insight on this topic. https://portal.research.lu.se/en/persons/dan-eric-nilsson https://optometry.berkeley.edu/people/martin-banks-phd/ References: [1] https://www.nei.nih.gov/learn-about-eye-health/healthy-vision/how-eyes-work [2] https://global.oup.com/academic/product/animal-eyes-9780199581139?cc=us&lang=en& [3] https://anatomypubs.onlinelibrary.wiley.com/doi/10.1002/ar.20529 [4] https://www.sciencedirect.com/science/article/abs/pii/0042698983900421 [5] https://www.researchgate.net/figure/1-Eye-of-the-primitive-mollusc-Nautilus-The-most-well-known-pin-hole-camera-in-the_fig2_346577917 [6] https://link.springer.com/article/10.1007/s10336-023-02054-y [7] https://www.owlpages.com/owls/articles.php?a=5 [8] https://www.science.org/doi/10.1126/sciadv.1500391#:~:text=Abstract,forward%20locomotion%20across%20uneven%20terrain. [9] https://pubmed.ncbi.nlm.nih.gov/23474299/#:~:text=We%20took%20infra%2Dred%20images,periphery%20of%20the%20visual%20field. [10] https://journals.biologists.com/jeb/article/222/4/jeb195966/20861/Elaborate-pupils-in-skates-may-help-camouflage-the [11]https://www.sciencedirect.com/science/article/abs/pii/0042698976900353