The routine examinations of the ear, nose and throat mostly lie the application of special instruments, together with the simultaneous use of artificial illumination.
Generally, the examinee and the examiner take the sitting position, facing each other (The infantile patient should be carried by the parent or the nurse. With the examined part being fixed), and the light source (commonly, the examiner wears a frontal mirror on the head and place the mirror hole on the left or right ear. Then, the examiner observes from the hole with uniocular squint. When the light ray projects on the frontal mirror, turn the mirror around, making the best focus of the catoptric light projected on the part to be examines.