Clinical applications of videolaryngoscopy (VLS) and videolaryngostroboscopy (VLSS) in phoniatrics were investigated. Altogether 150 patients with functional and organic lesions of the larynx and 50 normal subjects representing "voice" specialties were examined. Measurements of vibration, amplitude, frequency and oscillation asynchronicity of vocal cords yielded objective information about vibration in the norm and at pathology. VLS and VLSS can help identify functional and organic diseases of the larynx, document various pathological processes, evaluate the condition of the vocal apparatus, and compare pre- and postoperative laryngoscopic pictures. These methods can find application in training and therapeutic procedures for biofeedback purposes.