It's not just chlorine that irritates your eyes in a pool. It's actually something a lot more disgusting

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Sources:


https://www.cdc.gov/healthywater/swimming/aquatics-professionals/chloramines.html
http://cen.acs.org/articles/94/i31/chemical-reactions-taking-place-swimming.html
http://www.smithsonianmag.com/smart-news/urine-not-chlorine-causes-red-eyes-pools-180955712/
https://chlorine.americanchemistry.com/Science-Center/Chlorine-Compound-of-the-Month-Library/Chloramines-Understanding-Pool-Smell/
https://well.blogs.nytimes.com/2009/07/22/are-indoor-pools-bad-for-your-lungs/
http://www.npr.org/sections/health-shots/2017/03/01/517785902/just-how-much-pee-is-in-that-pool
https://www.cdc.gov/healthywater/pdf/swimming/resources/share-fun-not-germs-508c.pdf
http://www.health.nsw.gov.au/environment/factsheets/Pages/chloramines.aspx
http://pubs.acs.org/doi/abs/10.1021/es102423u
https://www.in.gov/isdh/files/How_To_Shock_The_Pool.pdf