Trick of the Trade: Fluorescein dye
This trick was written by Dr. Ciro Paolillo from the Italian EM website MedEmIt by Dr. Gemma Morabito et al. No, I don't read Italian but my browser, Google Chrome can! The browser automatically recognizes that the text is not in English and asks me if I want it translated. While the translation isn't perfect, I can definitely understand the gist. The following is a summary.
Apply a drop of fluorescein dye in the eye. The contact lens will absorb the dye and appear yellow. This serves as a reminder that you should check to be sure that patients have removed their contact lens before instilling fluorescein. It permanently stains the lens.