PE tubes are small tubes surgically placed in a child's ear to drain infection caused by recurrent ear infections or fluid buildup causing hearing loss. EENT refers to the eye, ear, nose and throat. BC refers to bone conduction, which causes one's voice to sound different when recorded and played back due to the skull conducting lower frequencies better through bone than air. OM refers to otitis media, commonly known as middle ear infection, often preceded by an upper respiratory infection. VA refers to visual acuity, the measurement of sharpness of one's vision.