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Chapter 15 Terms
Diagnostic, Symptomatic, and Related Terms
| Term | Definition |
|---|---|
| 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
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