Why Do Some Drugs Make Your Pupils Wider?

How do your pupils work and why do some substances make them dilate?

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Sources:
https://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0072432/
http://bjo.bmj.com/content/bjophthalmol/53/6/428.full.pdf
http://eyewiki.aao.org/Pharmacologic_dilation_of_pupil
https://www.scientificamerican.com/article/eye-opener-why-do-pupils-dialate/
https://www.scientificamerican.com/article/experts-chemical-pupil-dilate/
https://www.healthline.com/health/anticholinergics#drug-list
http://www.pamf.org/asthma/medications/inhaled/atrovent.html
https://www.healthline.com/health/mydriasis
https://www.ncbi.nlm.nih.gov/pubmedhealth/PMHT0025459/
http://scienceline.ucsb.edu/getkey.php?key=3036
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1629580/
https://books.google.com/books?id=mDLYCQAAQBAJ&pg=PA600&lpg=PA600&dq=dopamine+mydriasis&source=bl&ots=RVZQQjWvpw&sig=1fl4afkHFU3EZ3H7Wtv8HxflEz8&hl=en&sa=X&ved=0ahUKEwjCi8Wbj7HZAhWBKWMKHUoFBjYQ6AEIYDAH#v=onepage&q=dopamine%20mydriasis&f=false
https://io9.gizmodo.com/5966571/why-do-your-pupils-get-larger-when-youre-on-drugs
http://www.jefferson.edu/university/jmc/departments/neurosurgery/research/basic_research/coceffect.html
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Images:
http://www.thinkstockphotos.com/image/stock-illustration-human-eye-anatomy-vector-illustration/848075772
https://commons.wikimedia.org/wiki/File:Iris_close-up.jpg
https://commons.wikimedia.org/wiki/File:Eye_dilate.gif
Instructor with two giant eyes used for teaching (SC 041726), National Museum of Health and Medicine

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