Doctors sometimes insert a pressure-equalizing (PE) tube into an incision or opening in the eardrum to prevent middle ear infection. Bone conduction is the conduction of sound to the inner ear through the bones of the skull and is the reason why a person's voice sounds different when recorded and played back. Inflammation of the middle ear, or middle ear infection, is known as otitis media.

1. Chapter 13Special Senses Abbreviations

2. Pressure Equalizing Tube (PE Tube) Doctors sometimes insert a pressure-equalizing (PE) tube into an incision or opening in the eardrum to prevent middle ear infection

3. Eye, Ear, Nose, an Throat (EENT)

4. Bone Conduction (BC) the conduction of sound to the inner ear through the bones of the skull. Bone conduction is the reason why a person's voice sounds different to him/her when it is recorded and played back.

5. Both Ears (AU)

6. Otitis Media (OM) inflammation of the middle ear, or middle ear infection

7. Emmetropia (EM) the state of vision where an object at infinity is in sharp focus with the eye lens in a neutral or relaxed state

8. Exotropia (XT) is a form of strabismus where the eyes are deviated outward

9. Left Eye (OS)

10. Extraocular Movement (EOM)

11. Visual Acuity (VA) acuteness or clearness of vision.