The Ginger Filter
This fluorescein-enhancing filter was co-developed by Patrick D. Harris, Ph.D. of TelScreen and Herman H. Ginger, O.D. of Ginger Eye Care in Pine Bluff, AR specifically for slit lamp viewing. It rests comfortably on the objective lens without interfering with movement of the light source. Fluorescein really pops with this filter.
There is a 40nm gap between the excitation wavelength of sodium fluorescein and the wavelength of the fluorescent emission. A very steep cutoff is required to block the excitation light without reducing the intensity of the fluorescence.
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