Concentrated fluorescein dye (from a moistened fluorescein strip) is applied directly on the potential site of perforation while observing the site with the slit lamp (see Figure A.5.1). If a perforation and leak exist, the fluorescein dye is diluted by the aqueous and appears as a green (dilute) stream within the dark orange (concentrated) dye. The stream of aqueous is best seen with the cobalt blue light of the slit lamp.
