Blue filter discs and nasal endoscopic visualization of fluorescein lacrimal drainage

For the lacrimal surgeon, fluorescein instilled in the palpebral aperture, and combined with the use of blue filters, can assist office assessment of lacrimal drainage by nasal endoscopy. The fabrication of a separate blue filter attachment for nasal endoscopes, however, is expensive. Inexpensive, heat-stable blue filter discs were sourced from a manufacturer of fiberoptic instruments in Sydney, Australia. These discs can be made in various sizes suitable for standard battery-powered, portable nasal endoscopes. The discs were used in the postoperative assessment of a patient with lacrimal drainage-related pathology. They were easy to use and provided suitable wavelength transmission for improved assessment of fluorescein drainage through the lacrimal system.