Creative Study Chapter 5 Flashcards
Anterior Chamber
fluid-filled space between the cornea and iris that contains aqueous humor (water fluid)
Posterior Chamber
contains vitreous humor (gelatinous fluid)
Cornea
transparent, outer covering of the anterior portion
Pupil
Opening in the eye that lets light in
Iris
Colored part of the eye that contains muscles to regulate the pupil’s size
Sclera
white, tough, fibrous outer layer, extends from cornea to optic nerve
Choroid
Pigmented vascular layer between sclera and retina
Conjunctiva
mucous membrane lining the eyelids and outer eye surface
Lens
transparent structure posterior to the pupil that bends light rays on the retina to aid in focusing
Retina
nerve tissue in the inner posterior part of eye
Rods and Cones
visual receptors (neurons) in retina that respond to the light waves
Nerve fibers
from the rods and cones join in the optic disc from which optic nerve carries transmissions to brain
aque/o
water
blephar/o
eyelid
conjunctiv/o
conjuctiva (to bind together)
corne/o
cornea
cycl/o
circle, ciliary body
dacry/o
tear
lacrim/o
tear
ir/o
colored circle, iris
irid/o
colored circle, iris
kerat/o
cornea
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
condition of vision
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
diplopia
double vision
lacrimation
secretion of tears
scotoma
blind spot in vision
asthenopia
eyestrain (asthenia=weak condition)
blepharospasm
involuntary contraction of the muscles surrounding the eye causing uncontrolled blinking and lid squeezing
exophthalmos
abnormal protrusion of one or both eyeballs
nystagmus
involuntary, rapid, oscillating movement of the eyeball
photophobia
extreme sensitivity to, and discomfort from, light
cycloplegic
agent that paralyzes the ciliary muscle and the powers of accommodation; commonly used in pediatric eye examination
mydriatic
agent that causes dilation of the pupil; used for certain eye examinations
miotic
agent that causes the pupil to contract (mio=less)
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
blepharoplasty
surgical repair of an eyelid
cryoretinopexy
use of intense cold to seal a hole or tear in the retina; used to treat retinal detatchment
enucleation
excision of an eyeball
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)
myopia
nearsightedness
hyperopia
farsightedness
presbyopia
impaired vision cause by old age or loss of accommodation
amblyopia
decreased vision in earl life because of a functional defect that can occur as a result if strabismus, refractive errors (when one eye is more nearsighted, farsighted, or astigmatic than the other), or trauma; usually occurs in one eye; also known as lazy eye
aphakia
absence of the lens, usually after cataract extraction
cataract
opaque clouding if the lens causing decreased vision