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Why Do Some Drugs Make Your Pupils Wider?

How do your pupils work and why do some substances make them dilate? Written by: Jill Teige Hosted by: Hank Green Head to https://scishowfinds.com/ for hand selected artifacts of the universe! ---------- Support SciShow by becoming a patron on Patreon:   / scishow   ---------- Dooblydoo thanks go to the following Patreon supporters: Lazarus G, Kelly Landrum Jones, Sam Lutfi, Kevin Knupp, Nicholas Smith, D.A. Noe, alexander wadsworth, سلطان الخليفي, Piya Shedden, KatieMarie Magnone, Scott Satovsky Jr, Charles Southerland, Bader AlGhamdi, James Harshaw, Patrick Merrithew, Patrick D. Ashmore, Candy, Tim Curwick, charles george, Saul, Mark Terrio-Cameron, Viraansh Bhanushali, Kevin Bealer, Philippe von Bergen, Chris Peters, Justin Lentz ---------- Looking for SciShow elsewhere on the internet? Facebook:   / scishow   Twitter:   / scishow   Tumblr:   / scishow   Instagram:   / thescishow   ---------- Sources: https://www.ncbi.nlm.nih.gov/pubmedhe... http://bjo.bmj.com/content/bjophthalm... http://eyewiki.aao.org/Pharmacologic_... https://www.scientificamerican.com/ar... https://www.scientificamerican.com/ar... https://www.healthline.com/health/ant... http://www.pamf.org/asthma/medication... https://www.healthline.com/health/myd... https://www.ncbi.nlm.nih.gov/pubmedhe... http://scienceline.ucsb.edu/getkey.ph... https://www.ncbi.nlm.nih.gov/pmc/arti... https://books.google.com/books?id=mDL... https://io9.gizmodo.com/5966571/why-d... http://www.jefferson.edu/university/j... ------------ Images: http://www.thinkstockphotos.com/image... https://commons.wikimedia.org/wiki/Fi... https://commons.wikimedia.org/wiki/Fi... https://www.flickr.com/photos/medical...