NSG 261 chapter 11 assessing eyes
Exam 2 Questions And Correct
Answers.
structure and function of eye - Answer -eye is complex organ
-sight occurs when eyes and brain work together to detect, translate, and interpret incoming visible
spectrum electromagnetic radiation.
▪What is the thin membrane covering the front of the eye and eyelids called?
A.Conjunctiva
B.Tarsal plates
C.Lacrimal ducts
D.Aqueous humor - Answer conjunctiva- thing membrane cover upper eyelid
extraocular structures - Answer eyebrows, eyelashes: protect eyes
eyelids: protect and lubricate eyes. tarsal plates (firm lines of CT within eyelids that contain meiobomian
glands. palpebral fissures (distance between upper and lower eyelids)
conjunctive: thin membrane covering front of eye and inner eyelids
lacrimal glands: tear ducts that continually release tears and protective fluids to clean, lubricate, and
moisten eyes
intraocular structures - Answer sclera, intraocular muscles, aqueous humor, choroid, iris, lens, pupil,
posterior chamber, cornea, fundus, macula, optic disc, retina, and retinal blood vessels, arteries, and
veins
sclera - Answer white avascular tissue that protects eye and maintains shape of eyes
intraocular muscles - Answer six small muscles connect to sclera to control eye movements, secure
eyeball in sockets, and allow sight in different directions. (medial rectus, lateral rectus, superior rectus,
inferior rectus, superior oblique, and inferior oblique).
, aqueous humor - Answer water like fluid that fills anterior and posterior chambers to help maintain
eyeball shape. circulatory system in eyeball that control pressure
choroid - Answer layer of BVs between retina and sclera; supplies blood to retina
iris - Answer composed of CT and smooth muscle, colored part of eye. it can control pupil size
lens - Answer transparent, biconvex structure that refracts light to be focused on retina; changes shape
and thickness to be able to focus on objects.
pupil - Answer black part of center of the eye; determines amount of light that enters eye; average 2-4
mm in light, and 4-8 mm in dark
posterior chamber - Answer space between the iris and front of lens; filled with aqueous humor that
nourishes parts of eye.
cornea - Answer dome-shaped, avascular, transparent surface that covers front part of eye; covers iris,
pupil, and anterior chamber. allow light to enter and focus.
fundus - Answer posterior section of eye that include retina, choroid, focea, macula, optic disc, and
retinal vessels
macula - Answer yellow spot in retina responsible for central vision
retina - Answer multilayered, sensory portion that lines back of eye; millions of photoreceptors (rods
adn cones) that convert light ray to electrical impulses and transport them to optic nerve for
interpretation.
retinal blood vessels, arteries, and veins - Answer supply blood to retina.
diagnostics - Answer comprehensive is dilated eye exam to look directly at retina and internal
structures of eye.
