eye-glaucoma Flashcards
how much of info is taken in by the eye
70%
how much of into is taken in by the cerebrum
50%
eyebrows
coarse hair that keeps dirt out of the eye
eyelashes
soft hair that keeps dirt out of the eye
sty
infected eyelash
another name for eyelid
caruncle
3rd eyelid
vestigial organ that helped to see under water “bump”
how many eye muscles are there
6
what do eye muscles look like
brown rubber bands
lazy eye
lazy eye muscles (strabismus)
strabismus
lazy eye muscles
what are the 2 eye glands called
meibomian, ciliary
meibomian
oil gland in the eye
ciliary
sweat gland in the eye
function of tear ducts
dilute saline
lysozyme
tears
what do tears consist of
salt and H2O
function of tears
cleanse
conjunctiva
mucous membrane covering eye (sensitive to germs)
conjunctivitis
very contagious pink eye (infection, pus)
sclera
tough layer; white of the eye that gives shape,protection,anchors eye muscles)
function of sclera
gives shape,protection,anchors eye muscles
cornea
transparent with pain fibers, can be transplanted
iris
colored muscles (controls pupil)
where do we get the color of our iris from
parents
pupil
hole (Dim: dilates bright constricts) -reflexes
lenses
magnifies image
whats the ratio to age and lense
as age increases, ability to accommodate decreases (presbyopia)
presbyopia
lenses cant accommodate
cataracts
covering over lenses (white cover)
what did people believe cataracts are cause by
UV light
when do doctors remove cataracts
when they are ripe
retina
contains nerve tissue (rods, cones)
rods
sensitive to darkness (nerve) rhodopsin (purple) (vitamin A)
cones
sensitive to color
optic nerve
carries visual message to the brain < vision center
blind spot
where optic nerve leaves the retina
Fovea centralis
sharpest vision (only rods) (image lands on retina)
Aqueous humor
fluid
vitreous humor
gel
function of aqueous and vitreous humor
gives shape
where is aqueous humor located
front
where is vitreous humor located
back
glacoma
build up of pressure due to fluids (presses on optic nerve) ( halos around image)
cure to glacoma
make a small hole so that fluid goes in blood stream