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Special Senses Rev. Defs

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Term
Definition
vestibule   A chamber that joins the cochlea and semicircular canals  
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equilibrium   A state of balance, controlled by the semicircular canals and the vestibule  
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eustachian tube   A tube which connects the nose and the throat with the cavity of the middle ear  
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cerumen   A waxy secretion produced by the glands of the external ear canal to prevent the entrance of tiny foreign particles  
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refractive   Ability to bend light rays as they pass from one medium to another  
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epiphora   Abnormal overflow of tears  
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glaucoma   Accumulation of aqueous humor in the eye  
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accommodation   Adjustment of the eye for various distances so that the images fall on the retina of the eye  
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cycloplegic agents   Agents which paralyze ciliary muscles, causing dilation of the pupils  
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ametropia   An error in refraction causing poor focus  
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retinopathy   Any disorder of retinal blood vessels  
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humor   Any fluid or semifluid of the body  
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retinitis pigmentosa   Chronic progressive disease of degeneration of the retina and atrophy of the optic nerve  
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trachoma   Chronic, contagious form of conjunctivitis common in the southwestern USA that typically leads to blindness  
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acuity   Clearness or sharpness of a sensory function  
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anacusis   Complete deafness; also called anacusia  
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noise-induced hearing loss (NIHL)   Condition caused by the destruction of hair cells, the organs responsible for hearing, caused by sounds that are "too long, too loud or too close"  
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strabismus   Condition in which one eye is misaligned with the other or out of synchrony  
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ophthalmic decongestants   Constrict the small arterioles of the eye, decreasing redness and relieving conjunctival congestion  
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otoplasty   Corrective surgery for a deformed or excessively large or small pinna  
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blepharoplasty   Cosmetic surgery that removes fatty tissue above and below the eyes that commonly form as a result of the aging process or excessive exposure to the sun  
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dacryocystorhinostomy   Creation of an opening into the nose for draining of tears  
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antiglaucoma agents   Decrease aqueous humor production by constricting the pupil to open the angle between the iris and cornea  
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astigmatism   Defective curvature of the cornea or lens  
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corectasis   Dilation of the pupil  
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otopyorrhea   Discharge of pus from the ear  
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Ménière disease   Disorder of the labyrinth that leads to progressive loss of hearing  
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diabetic retinopathy   Disorder that occurs in patients with diabetes and is manifested by small hemorrhages, edema, and formation of new vessels on the retina, leading to scarring and eventual loss of vision  
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mydriatics   Disrupt parasympathetic nerve supply to the eye or stimulate the sympathetic nervous system, causing the pupil to dilate  
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otalgia   Ear pain  
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fluorescein angiography   Evaluation of blood vessels and their leakage in and beneath the retina after injection of fluorescein dye, which circulates while photographs of the vessels within the eye are obtained  
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tonometry   Evaluation of intraocular pressure by measuring the resistance of the eyeball to indentation by an applied force  
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retinoscopy   Evaluation of refractive errors of the eye by projecting a light into the eyes and determining the movement of reflected light rays  
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tuning fork test   Evaluation of sound conduction using a vibrating tuning fork  
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ectropion   Eversion, or outward turning, of the edge of the lower eyelid  
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gonioscopy   Examination of the angle of the anterior chamber of the eye to determine ocular motility and rotation and diagnose and manage glaucoma  
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iridectomy   Excision of the iris  
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hyperopia   Farsightedness  
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dacryorrhea   Flow of tears  
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perilymph   Fluid that very closely resembles spinal fluid but found in the cochlea  
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ear irrigation   Flushing of the ear canal with water or saline to dislodge foreign bodies or impacted cerumen  
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cyclodialysis   Formation of an opening between the anterior chamber and the suprachoroidal space for the draining of aqueous humor in glaucoma  
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otosclerosis   Hardening of the spongy bone around the oval window of the ear, causing hearing loss  
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audition   Hearing  
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nyctalopia   Impaired vision in dim light; also called night blindness  
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presbyacusis   Impairment of hearing resulting from old age; also called presbyacusia  
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radial keratotomy (RK)   Incision of the cornea for treatment of nearsightedness or astigmatism  
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otitis externa   Infection of the external auditory canal  
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conjuctivitis   Inflammation of the conjunctiva with vascular congestion, producing a red or pink eye and may be secondary to allergy or viral, bacterial, or fungal infections  
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eustachitis   Inflammation of the eustachian tube  
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labyrinthitis   Inflammation of the inner ear that usually results from an acute febrile process  
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iritis   Inflammation of the iris  
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otitis media   Inflammation of the middle ear  
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ophthalmic antibiotics   Inhibit growth of microorganisms that infect the eye  
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pressure-equalizing (PE) tube   Insertion of tubes through the tympanic membrane, commonly used to treat chronic otitis media; also called tympanostomy tubes or ventilation tubes  
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entropion   Inversion or inward turning of the edge of the lower eyelid  
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tunic   Layer or coat of tissue; also called membrane layer  
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amblyopia   Lazy eye syndrome  
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photopigment   Light-sensitive pigment in the retinal cones and rods that absorbs light and initiates the visual process; also called visual pigment  
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hordeolum   Localized, circumscribed, inflammatory swelling of one of the several sebaceous glands of the eyelid, generally caused by a bacterial infection; also called stye  
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wax emulsifiers   Loosen and help remove impacted cerumen  
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presbyopia   Loss of accommodation of the crystalline lens associated with the aging process  
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anosmia   Loss of sense of smell  
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audiometry   Measurement of hearing acuity at various sound wave frequencies  
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ophthalmodynamometry   Measurement of the blood pressure of the retinal vessels  
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electronystagmography (ENG)   Method of assessing and recording eye movements by measuring the electrical activity of the extraocular muscles  
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phacoemulsification   Method of treating cataracts by using ultrasonic waves to disintegrate a cloudy lens, which is then aspirated and removed  
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ciliary muscles   Muscles which relax or contract to alter the shape of the lens, making it thicker or thinner, thus enabling the light rays to focus upon the retina  
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mastoid process   One of the temporal bones which encloses the sinuses  
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stapes   One of the three bones of the middle; shaped like stirrups  
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malleus   One of the three bones of the middle; shaped like a hammer  
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incus   One of the three bones of the middle ear; shaped like an anvil  
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semicircular canals   One of the three structures of the inner ear; responsible for balance  
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Optometrist   One who specializes in eye measurements  
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cataracts   Opacities on the lens or the capsule that encloses the lens, causing loss of vision  
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exotropia   Outward turning of the eye(s)  
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ophthalmoplegia   Paralysis of the eye  
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visual acuity (VA) test   Part of an eye examination that determines the smallest letters that can be read on a standardized chart at a distance of 20 feet  
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tinnitus   Perception of ringing, hissing, or other sounds in the ears or head when no external sound is present  
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lacrimal   Pertaining to a tear  
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olfactory   pertaining to smell  
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cochear implant insertion   Placement of an artificial hearing device that produces hearing sensations by electrically stimulating nerves inside the inner ear; also called bionic ear  
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pneumatic otoscopy   Procedure that assesses the ability of the tympanic membrane to move in response to a change in air pressure  
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blepharoptosis   Prolapse of the eyelid  
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otic analgesics   Provide temporary relief from pain and inflammation associated with otic disorders  
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esotropia   Inward turning of the eye(s)  
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conduction impairment   Blocking of sound waves as they pass through the external and middle ear  
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dacryocystography   Radiographic imaging procedures of the nasolacrimal glands and ducts  
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tympanoplasty   Reconstruction of the eardrum, commonly due to perforation; also called myringoplasty  
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evisceration   Removal of the contents of the eye while leaving the sclera and cornea intact  
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enucleation   Removal of the eyeball from the orbit  
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vertigo   Sensation of a spinning motion either of oneself or of the surroundings  
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labyrinth   Series of intricate communicating passages  
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achromatopsia   Severe congenital deficiency in colour perception; also called complete colour blindness  
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ear canal   Slender tube lined with glands, through which sound waves travel to the middle ear  
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chalazion   Small, hard tumour developing on the eyelid, somewhat similar to a sebaceous cyst  
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cochlea   Snail-shaped inner ear structure  
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ophthalmic moisturizers   Soothe dry eyes due to environmental irritants and allergens  
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slit-lamp examination (SLE)   Stereoscopic magnified view of the anterior eye structures in detail, which includes the cornea, lens, iris, sclera, and vitreous humor  
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opaque   Substance or surface that neither transmits nor allows the passage of light  
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sclerostomy   Surgical formation of an opening in the sclera  
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mastoid antrotomy   Surgical opening of a cavity within the mastoid process  
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keratocentesis   Surgical puncture of the cornea  
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papilledema   Swelling and hyperemia of the optic disc, usually associated with increased intracranial pressure; also called choked disc  
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gustation   Taste  
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caloric stimulation test   Test that uses different water temperatures to assess the vestibular portion of the nerve of the inner ear to determine if nerve damage is the cause of vertigo  
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cornea   The clear, transparent portion of the sclera, anterior to the lens  
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sclera   The white of the eye, composed of a tough, fibrous tissue which serves as a protective shield for the more sensitive structures underneath  
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ossicles   Three tiny articulating bones in the middle ear  
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hairs of Corti   Tiny nerve ending within the cochlea which combine with cochlear fluid to generate nerve impulses to the brain via the auditory nerve  
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adnexa   Tissues or structures in the body adjacent to or near a related structure  
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ear antiemetics   Treat and prevent nausea, vomiting, dizziness, and vertigo by reducing the sensitivity of the inner ear to motion or inhibiting stimuli from reaching the part of the brain that triggers nausea and vomiting  
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Weber   Tuning fork test that evaluates bone conduction of sound in both ears at the same time  
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Rinne   Tuning fork test that evaluates bone conduction versus air conduction of sound  
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nystagmus   Type of involuntary eye movements that appear jerky and may reduce vision or be associated with other, more serious conditions that limit vision  
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photophobia   Unusual intolerance and sensitivity to light  
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intracapsular extraction   Use of a cold metal probe to remove cataracts  
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metamorphopsia   Visual distortion of objects  
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otoscopy   Visual examination of the external auditory canal and the tympanic membrane using an otoscope  
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ophthalmoscopy   Visual examination of the interior of the eye using a hand-held instrument called an ophthalmoscope, which has various adjustable lenses for magnification and a light source to illuminate the interior of the eye  
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