A member was on a boat ride on Rio Negro in Brazil when her eyes started burning. The river waters are similar in color to strong tea, which comes from humic acid due to an incomplete breakdown of phenol-containing vegetation from sandy clearings. She contacted Global Rescue. The member became increasingly uncomfortable during the boat ride. She removed her contact lenses and rinsed her eyes for relief. She tried locally-procured eye drops as well as an American brand but her condition didn’t improve. Due to the risk to her eyesight, Global Rescue medical operations advised the member to seek immediate medical attention. A medical evacuation by floatplane was initiated by Global Rescue operations due to the member’s remote location which had limited transportation options. The combined floatplane and ground transportation medical field rescue successfully delivered her to a hospital where she received antibiotic and other eye treatment from an ophthalmologist. After a short hospital stay, the member was discharged to further recover at her hotel before returning to her home in Texas after reporting her condition had improved.