Eye examinations performed on 50 subjects immediately before and after swimming in a chlorinated pool showed that 34 subjects (68%) saw rainbows and/or halos around lights after swimming, a symptom indicating the presence of corneal edema. Forty-seven subjects (94%) had corneal epithelial erosions in a punctate or linear pattern demonstrated by fluorescein staining on slit-lamp examination. No subject experienced a measurable decrease in visual acuity.
Haag JR, Gieser RG. Effects of Swimming Pool Water on the Cornea. JAMA. 1983;249(18):2507–2508. doi:10.1001/jama.1983.03330420053035
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