Otoscopy :: INSTRUMENTATION :: 2_1
 INSTRUMENTATION  
Perforated head mirror with webbing forehead band 

(Downs Bros, Church Path, Mitcham, Surrey CR4 3VE, UK).

Perforated head mirror with webbing forehead band

(Downs Bros, Church Path, Mitcham, Surrey CR4 3VE, UK).

Description : The majority of head mirrors are 3 2' inches (89 min) in diameter, with a central aperture approximately 4' inch (19 min) in diameter. The concavity of the mirror is designed to concentrate the source of light at a distance or focal length of 7 21 inches (190 mm). Various models of head mirrors incorporating adjustable headbands of webbing, fibre or polyethylene are available.
 
The goose‑neck joint between the mirror and the headband is an essential feature which enables the mirror to be easily adjusted. The mirror should be large enough to concentrate light, but not so large that it obstructs vision by the other eye. The primary advantage of the head mirror is that it is light and portable, and, if well designed, the illumination provided is very bright.

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