Unit 3 - Eye Flashcards
cor/o
pupil/o
pupil
dark center of eye
corne/o
kerat/o
cornea fibrous, transparent layer of clear tissue that extends over the anterior of the eye & iris - helps w/refraction of light - avascular - no blood vessels - cataracts appear here
phak/o
phac/o
lens of eye
flat for distant vision
thicken/round for close vision
- helps w/refraction of light
retin/o
retina
thin, nerve layer that contains rods & cones
- Rods = Reduced light
- Cones = Color and Central vision
conjunctiv/o
conjunctiva - thin lining membrane
coats anterior portion of eyeball
dust & smoke dilate blood vessels to produce redness
scler/o
sclera
white of the eye
CHOROID - dark brown membrane inside the sclera
- provides nutrients to the eye
ir/o
iris
colored portion of the eye
a muscle that surrounds the pupil of the eye
ocul/o
ophthalm/o
optic/o
opt/o
eye
what do iris & pupil do in: bright light?
iris closes
pupil constricts
miosis - contraction of pupil
what do iris & pupil do in: dim light?
iris opens
pupils dilate
mydriasis - enlargement of pupils
mi/o
smaller, less
mydr/o
widen, enlarge
cycl/o
ciliary body
muscle located next to lens
1. thickens & thins lens for refraction
2. secretes aqueous humor (AH) - found in anterior chamber
Function & purpose of Aqueous Humor
- maintains the shape of anterior portion of the eye
- nourishes structures in that region
- aids in refraction of light
vitre/o vitreous humor (VH)
- located inside vitreous chamber (posterior portion)
- VH maintains shape of eyeball
- NOT replenished by body
- aids in refraction of light
optic disc
region in back of eye where optic nerve meets the retina. Blind spot
optic nerve fiber
cranial nerve carrying impulses from retina to brain (cerebral cortex)
optic chiasm
point at which optic nerve fibers cross in the brain
optic nerve tract
where impulses travel to brain
thalamus
relay center center of brain
optic nerve fibers pass thru here on way to cerebral cortex
cerebral cortex
where images from R & L are fused into single visual sensation
accommodation
normal adjustment of the eye for seeing objects at various distances
astigmatism
defective curvature of the cornea or lens of the eye
image is distorted
presby/opia
presby/o - old age
- opia - vision
impairment of vision as a result of old age
loss of elasticity
hyperopia
farsightedness
light is hitting behind the disk
myopia
nearsightedness
light hits in front of disk
corrected with biconcave lens
ambly/o
dim, dull
amblyopia - dull vision; lazy eye
dipl/o
double
diplopia - double vision
nyct/o
night
nyctalopia - night blindness
phot/o
light
photophobia - light sensitivity
-opsia
vision condition
hemianopsia - reduced vision/blindness in 1/2 visual field
blephar/o
eyelid
blepharoptosis - drooping of eyelid
dacry/o
lacrim/o
tears
lacrimal ducts -
kreatoplasty
surgical repair of cornea
vitrectomy
surgery to remove some or all the vitreous humor from the eye
IOP
intraoccular pressure
OD
right eye
OU
both eyes
OS
left eye
VF
visual field
VH
vitreous humor
AH
aqueous humor
retinal detachment
retinas detach
repaired w/scleral buckle
diabetic retinopathy
macular edema
microaneurysms
hemorrhaging & dilution of retinal veins
opthalmoscope
used to examine or visualize the interior vessels of the eye
cataracts
clouding of the lens
causes decreased vision
treated with lens replacement surgery
LASER
Light Amplification by Stimulated Emissions of Radiation
- treatment for retinopathy
strabismus
abnormal deviation of eye due to muscle weakness
hordeolum
stye