title: A simple blue filter for the pocket flashlight.
abstract: I devised an easily constructed blue filter for use with a disposable pocket flashlight for detecting fluorescein staining in external disease that can be kept in the pocket and placed on and off the light with ease.
mesh_terms: D005452:Fluoresceins; D006801:Humans; D008027:Light; D008029:Lighting; D009885:Ophthalmology / Q000295:instrumentation*
chemical_list: D005452:Fluoresceins