As far as I know, toner is used to add color to something like beverages, and it is just a chemical product, which is irritative to your eyes. Exposure to toner would give rise to a lot of problems including red eyes, and even infections. Therefore, you need to wash your eyes with a great deal of water with salt and try to get some eye drops to cure the infections. If the situations remains bad, you can consult a doctor.
Generally speaking, it is really painful when the toner gets into our eyes. As far as I can remember, I have experienced once, it is really annoyed me and I spent long time to clear it. So I think you can just follow my advice; once the toner gets into your eyes, you should wash your eyes with the cold-luke warm water immediately so that you can wash the toner out with tears. At most occasion, your eyes will become red when the toner gets into your eyes, and then pls take it easy, because after washing them, the redness will disappear later. Oh, here I also want to tell you while washing your eyes; you should keep it for at least 15 minutes instead of just one or two minutes so that you can wash all of the toner out of your eyes. At last, if you still feel discomfort, you can just close your eyes making them have a rest. Be more careful in the future and good luck!
You'd better get the toner out of the eyes by washing the eyes with clean water. After you clean it out, you'd better use the warm cloth to cover on the eyes to make the eyes get release. Then you could also use some eye drops to make the eyes feel comfortable.