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Chapter 18
Essential Medical Terminology 3rd Edition, Eyes and Ears
137
Biology
Undergraduate 3
04/01/2013

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Term
Sclera
Definition
tough white outer coat of the eyeball
Term
Conjunctiva
Definition
membrane lining the eyelids and covering the eyeball
Term
Cornea
Definition
transparent anterior part of the eye
Term
Choroid
Definition
the middle, vascular coat of the eye, between the sclera and the retina
Term
Iris
Definition
pigmented membrane behind the cornea, perforated by the pupil
Term
Pupil
Definition
opening in the center through which light enters the eye
Term
Lens
Definition
transparent body separating the posterior chamber and constituting the refracting mechanism of the eye
Term
Ciliary Muscle
Definition
eye muscle capable of changing lens shape during contraction and relaxation
Term
Aqueous Humor
Definition
watery liquid in chamber in the front of the lens; it circulates through the anterior chamber of the eye
Term
Vitreous Humor
Definition
jellylike transparent substance in the posterior chamber
Term
Retina
Definition
innermost layer of the eyeball, containing elements for reception and transmission of visual stimuli
Term
Amblyopia
Definition
dimness of vision without a detectable organic lesion of the eye; related to absence, weakness, or paralysis of an eye muscle
Term
Astigmatism
Definition
condition characterized by irregular cornea and lens of the eye; corrected with lenses
Term
Blepharitis
Definition
inflammation of the eyelids
Term
Cataract
Definition
opaque (not clear) lens of the eye
Term
Chalazion
Definition
a small eyelid mass resulting from chronic inflammation of a meibomian gland
Term
Color Blindness
Definition
popular term for any deviation from normal perception of color
Term
Conjunctivitis
Definition
inflammation of the conjunctiva
Term
Corneal Ulcer
Definition
a local inflammation of the cornea caused by injury or inflammation
Term
Dacryoadentitis
Definition
inflammation of a lacrimal gland
Term
Dacryocystitis
Definition
inflammation of a lacrimal gland
Term
Dacryolith
Definition
a lacrimal calculus (stone)
Term
Detached Retina
Definition
separation of the inner layers of the retina from the pigment epithelium
Term
Diabetic Retinopathy
Definition
scarring of the capillaries of the retina as a consequence of DM of long duration. Retinal effects of DM include abnormal dilation of the retinal veins, hemorrhage, microaneurysms, and neovascularization (new blood vessels forming near the optic disk causing leakage of blood). These effects cause a permanent decline in vision and will lead to blindness.
Term
Floaters (In Vitreous)
Definition
"spots before the eyes"; these deposits in the vitreous of the eye usually move about and are probably a benign degenerative change. Also seen in hypertension
Term
Foreign Body In The Eye
Definition
any object not belonging to the eye; hazards depending on circumstances
Term
Glaucoma
Definition
eye disease characterized by an increase in intraocular pressure related to alterations in circulation of vitreous humor, causing pathologic changes and visual defects
Term
Hemorrhage (Subconjunctival)
Definition
blood escaping from the vessels, and bleeding from beneath the conjunctiva
Term
Herpes Zoster (Ophthalmic)
Definition
involving the fifth cranial nerve (forehead, eyelid, and cornea), this infection by a herpes virus can be serious
Term
Hyperopia
Definition
farsightedness, e.g., the person cannot read a book
Term
Injury
Definition
eye injuries include foreign bodies, contusions, lacerations, burns, etc.
Term
Iritis
Definition
inflammation of the iris
Term
Keratoconus
Definition
conical protrusion of the central part of the cornea
Term
Macular Degeneration
Definition
deterioration of the macula of the eye, resulting in a severe loss of central vision in the affected eye
Term
Meibomian Cyst
Definition
a small localized swelling of the eyelid resulting from obstruction and retained secretions of the meibomian glands. A nonmalignant condition; often requires surgery for correction
Term
Nystagmus
Definition
involuntary rapid movement (horizontal, vertical, rotary, or mixed, i.e., of two types) of the eyeball
Term
Papilledema
Definition
edema of the optic disk
Term
Presbyopia
Definition
diminution of accommodation of the lens of the eye caused by loss of elasticity, normally occurring with aging; farsightedness
Term
Ptosis
Definition
drooping of upper eyelid
Term
Retinitis
Definition
inflammation of the retina
Term
Retinoblastoma
Definition
a tumor arising from the retinal cells
Term
Retinopathy
Definition
any disease of the retina
Term
Strabismus
Definition
squint; deviation of the eye from normal; crossed eyes; usually correctable
Term
Stye (Or Hordeolum)
Definition
inflammation of the sebaceous glands of the eyelid
Term
Trachoma
Definition
a contagious disease of the conjunctiva and cornea, producing photophobia, pain, and lacrimation; uncommon
Term
Uveitis
Definition
inflammation of the uvea (iris and blood vessels)
Term
Cataract Extraction
Definition
a surgical excision of the lens of the eye. Special lenses or glasses are prescribed
Term
Cryoextraction
Definition
application of extremely low temperature for the removal of a cataractous lens
Term
Dacryocystotomy
Definition
incision of the lacrimal sac and duct
Term
Enucleation
Definition
surgical removal of the eye
Term
Fundoscopy
Definition
examination and study of the fundus of the eye by means of an ophthalmoscope
Term
Gonioscopy
Definition
instrument for demonstrating ocular motility and rotation
Term
Iridectomy
Definition
excision of part of the iris
Term
Iridencleisis
Definition
excision of part of the iris in glaucoma
Term
Keratoplasty
Definition
plastic surgery of the cornea; corneal grafting
Term
Laster Photocoagulation
Definition
using the laser beam to treat retinal detachment
Term
Pterygium Surgery
Definition
growth of the conjunctiva: neovascularization that invades the cornea; it can be removed surgically
Term
Slit Lamp
Definition
an instrument used in ophthalmology for examining the conjunctiva, lens, vitreous humor, iris, and cornea. A high-intensity beam of light is projected throug ha narrow slit and cross-section of the illuminated part of the eye is examined through a magnifying lens
Term
Tonometer
Definition
instrument for measuring tension or pressure, especially intraocular pressure
Term
Trabeculectomy
Definition
excision of fibrous bands or connective tissue
Term
Vitrectomy
Definition
aspiration of vitreous fluid and replacement with saline solution
Term
Accommodation
Definition
adjustment of the eye for seeing objects at various distances
Term
Anisocoria
Definition
inequality in size of the pupils of the eyes
Term
Braille
Definition
a system of printing for the blind consisting of raised dots and prints that can be read by touch
Term
Canal of Schlemm
Definition
opening through which aqueous humor must flow out or pressure in the eye increases resulting in glaucoma
Term
Canthus (pl., Canthi)
Definition
the angle at either end of the fissure between the eyelids
Term
CC
Definition
with correction (glasses or lenses)
Term
Cryoprobe
Definition
an instrument for applying extreme cold to tissue
Term
Cystitome
Definition
an instrument for opening the lens capsule
Term
Diopter
Definition
unit of measure for lenses
Term
Electronystagmography
Definition
recordings of eye movements to provide objective documentation of induced and spontaneous nystagmus
Term
Emmetropia
Definition
normal vison
Term
Eye Bank
Definition
storage for donor organs
Term
Fundus
Definition
the back portion of the interior of the eyeball, visible through the pupil by use of the ophthalmoscope
Term
Funduscope (Or Ophthalmoscope)
Definition
an instrument containing a perforated mirror and lenses used to examine the interior of the eye
Term
Guide Dogs
Definition
secretion and discharge of tears
Term
Laser
Definition
a device that transfers light of various frequencies into an extremely intense, small beam of radiation. It is used as a tool in surgery, in diagnosis, and in physiologic studies
Term
Lensometer
Definition
device for obtaining eyeglass prescriptions
Term
Miotic (Or Myotic)
Definition
a drug that causes contraction of the pupil
Term
Mydriatic
Definition
a drug that dilates the pupil
Term
OD
Definition
abbreviation for oculus dexter (right eye)
Term
Ophthalmoscope
Definition
instrument containing a perforated mirror and lenses, used to examine the interior of the eye; also called funduscope
Term
OS
Definition
abbreviation for oculus sinister (left eye)
Term
OU
Definition
abbreviation for oculus uterque (each eye) or oculus unitas (both eyes)
Term
Peripheral Vision
Definition
vision at the outer edges when the eyes are looking straight ahead
Term
PERRLA (or PERLA)
Definition
acronym for Pupils Equal, Round, React to Light, Accommodation
Term
Refractive Error
Definition
the determination of the refractive errors of the eye and their correction with glasses or lenses
Term
SC
Definition
without correction (glasses or lenses)
Term
Snellen Eye Chart
Definition
one of several charts used in testing visual acuity. Letters, numbers, or symbols are arranged on the chart in decreasing size from top to bottom
Term
Visual Acuity (VA)
Definition
clarity or clearness of vision
Term
20/20 Vision
Definition
a person who can read what the average person can read at 20 feet
Term
External Ear
Definition
auricle (or pinna) or ear canal
Term
Middle Ear
Definition
separated from the external ear by the tympanic membrane; consists of three bones: malleus, incus, and stapes
Term
Inner Ear
Definition
the complex inner structure of the ear: vestibule, semicircular canals, and cochlea, composing the membranous labyrinth
Term
Tympanic Membrane
Definition
the thin partition between the external acoustic meatus and the middle ear
Term
Tympanium
Definition
eardrum (middle ear)
Term
Cerumen
Definition
earwax
Term
Eustachian Tube
Definition
a tube, lined with mucous membrane, the joins the nasopharynx and the tympanic cavity; accomplishes equalization of air pressure
Term
Acoustic Neuroma
Definition
a benign tumor arising from the acoustic nerve in the brain. This tumor causes tinnitus, vertigo, and decreased hearing. Small tumors may be surgically resected or removed by radiation therapy
Term
Cholesteatoma
Definition
a collection of skin cells and cholesterol in a sac with the middle ear. These cystlike masses are most often the result of chronic otitis media, but may also be congenital defect.
Term
Conduction Deafness
Definition
hearing loss that occurs when the conduction of sound waves through the external and middle ear to the inner ear is impaired
Term
Deafness
Definition
lacking the sense of hearing; hearing impairment
Term
Eustachian Salpingitis
Definition
inflammation of the eustachian tubes
Term
Furunculosis
Definition
a skin infection affecting the ear canal
Term
Impacted Cerumen
Definition
cerumen (earwax) impacted firmly into the ear
Term
Labyrinthitis
Definition
inflammation of the labyrinth (inner ear); otitis interna
Term
Mastoiditis
Definition
inflammation of the mastoid antrum and cells (of the temporal bone)
Term
Meniere's Disease
Definition
deafness, tinnitus, and dizziness; causes unknown
Term
Myringitis
Definition
inflammation of the tympanic membrane (eardrum)
Term
Otitis Externa
Definition
inflammation of the external ear
Term
Otitis Media
Definition
inflammation of the middle ear
Term
Otosclerosis
Definition
ankylosis of the stapes, resulting in conductive hearing loss
Term
Presbycusis
Definition
progressive hearing loss in some elderly persons
Term
Sensorineural Deafness
Definition
also called nerve deafness, this type of hearing loss results from physical damage to the hair cells, the vestibulocochlear nerve, or the auditory cortex. This condition may occur because of aging. Explosions, extremely loud noises, such as from machinery or loud music, and some antibiotics can damage the hair cells in the organ of Corti, creating partial to complete deafness. Other causes include brain tumors, strokes, infections, trauma, vascular disorders, and degenerative diseases
Term
Fenestration
Definition
the surgical creation of a new opening in the labyrinth of the ear for restoration of hearing in otosclerosis
Term
Mastoidectomy
Definition
excision of the mastoid cells or the mastoid process
Term
Myringotomy
Definition
incision of the tympanic membrane; tympanotomy with placement of tubes to maintain drainage
Term
Otoplasty
Definition
plastic surgery of the ear (pinna)
Term
Stapedectomy
Definition
excision of the stapes
Term
Tympanoplasty
Definition
plastic surgery on the eardrum
Term
Tympanotomy
Definition
myringotomy; incision of the tympanic membrane
Term
Acoustic Meatus
Definition
opening or passage in the ear
Term
AD
Definition
auris dextra, right ear
Term
AS
Definition
auris sinistra, left ear
Term
AU
Definition
aures unitas (both ears) or auris uterque (each ear)
Term
Audiometer
Definition
a device for testing the hearing
Term
Audiometrist
Definition
person who performs hearing tests
Term
Auditory (Or Acoustic)
Definition
pertaining to the ear; sense of hearing
Term
Decibel
Definition
a unit of measure of the intensity of sound
Term
Hearing Aid
Definition
a device used to increase the intensity of sound
Term
Hearing-Ear Dogs
Definition
dogs trained to respond to sounds and alert the hearing-impaired person
Term
Otoscope
Definition
an instrument used for inspecting the ear
Term
Otoscopy
Definition
examination of the ear by means of the otoscope
Term
Sign Language
Definition
communication by means of manual signs and gestures
Term
Tinnitus
Definition
a noise (ringing) in the ears
Term
Tuning Fork
Definition
a small metal instrument consisting of a stem and two prongs used to test hearing
Term
Vertigo
Definition
a sensation of rotation or dizziness
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