Chapter 13 PresentationThe Eye and Ear

By: Stacey Smith

Pressure Equalizing Tube (PE Tube)

This is needed when the Eustachian Tube is not functioning properly.

This can cause Serous Otitis Media

After making an incision in the eardrum and suctioning out any middle ear fluid, a tiny hollow tube made of plastic or metal is inserted into the eardrum. Over time, the tube is pushed out as the eardrum heals. A pressure equalization tube usually provides middle ear ventilation for 6 to 12 months. Often, the Eustachian tube will have recovered by this time and the pressure equalization tubes need not be replaced

Eyes, Ears, Nose, Throat (EENT) Eyes are organs that

detect light, and transmit external images to via optic nerve to the brain

Ears is the organ that detects sound

Nose is the organ use to detect smell

Throat is the anterior part of the neck, in front of the vertebral column. It consists of the pharynx and larynx

Bone Conduction (BC) Bone conduction is the transmission of

sound to the inner ear through the bones of the skull

Both Ears (AU) Vertebrates have a pair of ears, placed

symmetrically on opposite sides of the face

This arrangement aids in the ability to localize sound sources

Otitis Media (OM) is inflammation of the middle ear, or

middle ear infection Otitis media occurs in the area between the

tympanic membrane (the end of the outer ear) and the inner ear, including a duct known as the eustachian tube

Emmetropia (EM) Describes the state of vision where an object

at infinity is in sharp focus with the eye lens in a neutral or relaxed state

This condition of the normal eye is achieved when the refractive power of the cornea and the axial length of the eye balance out, which focuses rays exactly on the retina resulting in perfect vision

An eye in a state of emmetropia requires no correction

Exotropia (X) is a condition of

strabismus where the eyes are deviated outward

Strabismus is a condition in which the eyes are not properly aligned with each other

Left Eye (OS)

Extraocular Movement (EOM) The extraocular muscles are the

six muscles that control the movements of the (human) eye. The actions of the extraocular muscles depend on the position of the eye at the time of muscle contraction.

Visual Acuity acuteness or clearness of vision,

especially form vision, which is dependent on the sharpness of the retinal focus within the eye and the sensitivity of the interpretative faculty of the brain

a measure of the spatial resolution of the visual processing system and is usually tested in a manner to optimize and standardize the conditions

Refrences: Medical Terminology A Living Language www.summitmedicalgroup.com www.kidshealth.org