Chapter 5: the eye Flashcards
Aque/o
H20
conjunctiv/o
conjunctiva (to bind together
corne/o
cornea
kerat/o
cornea
ir/o
colored circle, iris
irid/o
colored circle, iris
lacrim/o
tear
dacry/o
tear
ocul/o
eye
ophthalm/o
eye
opt/o
eye
phac/o
lens (lentil)
phak/o
lens (lentil)
phot/o
light
presby/o
old age
retin/o
retina
scler/o
hard or sclera
vitre/o
glassy
-opia
suffix
condition of vision
aque/o
water
anterior chamber
Fluid-filled space between the cornea and iris
aqueous humor
Watery liquid secreted by the ciliary processes that fills the anterior and posterior chambers of the eye and provides nourishment for the cornea, iris, and lens (humor=fluid)
conjuctiva
Mucous membrane that lines the eyelids and outer surface of the eyeball
cornea
Transparent, anterior part of the eyeball covering the iris, pupil, and anterior chamber that functions to refract (bend)light to focus a visual image
iris
Colored circle; colored part of the eye located behind the cornea that contracts and dilates to regulate light passing through the pupil
lacrimal gland
Gland located in the upper outer region above the eyeball that secretes tears
lens
Transparent structure behind the pupil that bends and focuses light rays on the retina
optic nerve
Nerve responsible for carrying impulse for the sense of sight from the retina to the brain
posterior chamber
Space between the back of the iris and the front of the vitreous chamber; filled with aqueous humor
pupil
Black, circular opening in the center of the iris through which light passes as it enters the eye
retina
Innermost layer that perceives and transmits light to the optic nerve
vitreous
Jelly-like mass filling the inner chamber between the lens and retina that gives bulk to the eye
diplopia
Double vision
exophthalmos
Abnormal protrusion of one or both eyeballs; also spelled exophthalmos
lacrimation
Secretion of tears
photophobia
Extreme sensitivity to, and discomfort from light
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)
hyperopia
Farsightedness; difficulty seeing close objects when light rays are focused on a point behind the retina
myopia
Nearsightedness; difficulty seeing distant objects when light rays are focused on a point in front of the retina
presbyopia
Impaired vision caused by old age or loss of accommodation
cataract
Opaque clouding of the lens causing decreased vision
conjunctivitis
Inflammation of the conjunctiva; also called pinkeye
glaucoma
Group of diseases of the eye characterized by increased intraocular pressure that results in damage to the optic nerve, producing defects in vision
iritis
Inflammation of the iris
keratitis
Inflammation of the cornea
retinal detachment
Separation of the retina from the underlying epithelium, disrupting vision and resulting in blindness if not repaired surgically
retinitis
inflammation of the retina
strabismus
Separation of the retina from the underlying epithelium, disrupting vision and resulting in blindness if not repaired surgically
scleritis
Inflammation of the sclera
distance of visual acuity
Measure of the ability to see the details and shape of identifiable objects from a specified distance, usually from 20 ft using a Snellen eye chart; normal distance visual acuity is 20/20
ophthalmoscopy
Use of an ophthalmoscope to view the interior of the eye
tonometry
Uses of a tonometer to measure intraocular pressure, which is elevated in glaucoma
cataract extraction
Excision of a cloudy lens from the eye
keratoplasty
Corneal transplantation; replacement of a diseased or scarred cornea with a healthy one from a matched donor
IOL implant
Implantation of an artificial lens to replace a defective natural lens (eg after cataract extraction)
sclera
Tough, fibrous, white outer coat extending from the cornea to the optic nerve
eye instillation
Introduction of a medicated solution in the eye, usually administered by a drop (gt) or drops (gtt) in the affected eye or eyes
eye irrigation
Washing of the eye with water or other fluid (saline)
antibiotic ophthalmic solution
Antimicrobial agent in solution; used to treat bacterial infections (conjunctivitis) and corneal ulcers
mydriatic
agent that causes dilation of the pupil; used for certain eye examinations
miotic
Agent that causes the pupil to contract (mio=less)