Ch. 10 Diagnostic Terms Flashcards Preview

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Flashcards in Ch. 10 Diagnostic Terms Deck (34):
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refractive errors

defects in the bending of light as it enters the eye, causing an improper focus on the retina

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astigmatism

distorted vision caused by an oblong or cylindrical curvature of the lens or cornea that prevents light rays from coming to a single focus on the retina (stigma = point)

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hyperopia

farsightedness

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myopia

nearsightedness

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presbyopia

impaired vision caused by old age or loss of acommodation

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accommodation

ability of the eye to adjust focus on near objects

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amblyopia

lazy eye (ambly/o = dim)

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aphakia

absence of the lens, usually after cataract extraction

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blepharitis

inflammation of the eyelid

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blepharochalasis; dermatochalasis

baggy eyelid; overabundance and loss of skin elasticity on the upper eyelid causing a fold of skin to hang down over the edge of the eyelid when the eyes are open (chalasis = a slackening)

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blepharoptosis; ptosis

drooping of the eyelid; usually caused by paralysis

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chalazion

chronic nodular inflammation of the meibomian gland, usually the result of a blocked duct; commonly presents as a swelling on the upper and lower eyelid (chalaza = hailstone)

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cataract

opaque clouding of the lens causing decreased vision

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conjunctivitis

pinkeye; inflammation of the conjunctiva

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dacryoadenitis

inflammation of the lacrimal gland

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dacryocystitis

inflammation of the tear sac

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diabetic retinopathy

disease of the retina in diabetics characterized by capillary leakage, bleeding, and new vessel formation (neovascularization) leaading to scarring and loss of vision

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ectropion

outward turning of the rim of the eyelid (tropo = turning)

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entropion

inward turning of the rim of the eyelid

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epiphora

abnormal overflow of tears caused by blockage of the lacrimal duct (epi = upon; phero = bear)

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glaucoma

group of diseases of the eye characterized by increased intraocular pressure that results in damage to the optic nerve, producing defects in vision

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hordeolum

sty; an acute infection of a sebaceous gland of the eyelid (hordeum = barley)

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iritis

inflammation of the iris

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keratitis

inflammation of the cornea

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macular degeneration

breakdown or thinning of the tissues in the macula, resulting in partial or complete loss of central vision

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pseudophakia

an eye in which the natural lens is replaced with an artificial lens implant

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pterygium

fibrous, wing-shaped growth of conjunctival tissue that extends onto the cornea, developing most commonly from prolonged exposure to ultraviolet light

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retinal detachment

separation of the retina from the underlying epithelium, disrupting vision and resulting in blindness if not repaired surgically

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retinitis

inflammation of the retina

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strabismus; heterotropia

a condition of eye misalignment caused by intraocular muscle imbalance (strabismus = a squinting; hetero = other)

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esotropia

right or left eye deviates inward, toward nose (eso = inward; tropo = turning)

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exotropia

right or left eye deviates outward, away from the nose (eso = inward; tropo = turning)

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scleritis

inflammation of the sclera

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trichiasis

misdirection eyelashes that rub on the conjunctiva or cornea

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