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Chapter 15 Terms

Diagnostic, Symptomatic, and Related Terms

TermDefinition
achromatopsia Severe congenital deficiency in color perception; also called complete color blindness
chalazion Small, hard tumor developing on the eyelid, somewhat similar to a sebaceous cyst
conjunctivitis Inflammation of the conjunctiva with vascular congestion, producing a red or pink eye; may be secondary to viral, bacterial, or fungal infections or allergy
convergence Medial movement of the two eyeballs so that they are both directed at the object being viewed
diopter Measurement of refractive error
ectropion Eversion, or outward turning, of the edge of the lower eyelid
emmetropia (Em) State of normal vision
entropion Inversion or inward turning of the edge of the lower eyelid
epiphora Abnormal overflow of tears
exophthalmos Protrusion of one or both eyeballs
hordeolum Localized, circumscribed, inflammatory swelling of one of the several sebaceous glands of the eyelid, generally caused by a bacterial infection; also called stye
metamorphopsia meta-: change; beyond Visual distortion of objects
nyctalopia nyctal: night Impaired vision in dim light; also called night blindness
nystagmus Involuntary eye movements that appear jerky and may reduce vision or be associated with other, more serious conditions that limit vision
papilledema Edema and hyperemia of the optic disc usually associated with increased intracranial pressure; also called choked disc
photophobia Unusual intolerance and sensitivity to light
presbyopia Loss of accommodation of the crystalline lens associated with the aging process
retinopathy Any disorder of retinal blood vessels
diabetic 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
trachoma Chronic, contagious form of conjunctivitis common in the southwestern United States that typically leads to blindness
visual field Area within which objects may be seen when the eye is in a fixed position
anacusis Complete deafness; also called anacusia
conduction impairment Blocking of sound waves as they pass through the external and middle ear (conduction pathway)
labyrinthitis Inflammation of the inner ear that usually results from an acute febrile process
Ménière disease Disorder of the labyrinth that leads to progressive loss of hearing
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”
otitis externa Infection of the external auditory canal
presbyacusis Impairment of hearing resulting from old age; also called presbyacusia
pressure-equalizing (PE) tubes Tubes that are inserted through the tympanic membrane, commonly to treat chronic otitis media; also called tympanostomy tubes or ventilation tubes
tinnitus Perception of ringing, hissing, or other sounds in the ears or head when no external sound is present
vertigo Hallucination of movement, or a feeling of spinning or dizziness
Created by: Esuvill0