<unk>  or photo-electric glottography is a laboratory technique for investigating the opening and closing of the glottis in the larynx. It detects variations in the amount of light that can pass through the glottis as it opens and closes.
Photoglottography
Salicylate testing
Phonomyography
Biodosimetry
Rhinomanometry
Sialoendoscopy
Caloric reflex test
Gonioscopy