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Lewis Chapter 20: Assessment of Visual and Auditory Systems
Terms in this set (26)
What are the external structures of the eye?
What are the internal structures of the eye?
Name the 3 layers of the eyeball
-outer: sclera and cornea
-middle: iris, choroid, ciliary body
-clear watery fluid found in the anterior chamber of the eye
***nourishes the cornea and lens
What is the normal range of IOP?
10-21 mm Hg
Which condition is caused by increased IOP?
How is the lens shape modified?
by the ciliary body
*part of accommodation
transparent gel-like fluid found in the posterior cavity
when light does not focus properly
*near objects clearly, blurred vision in the distance
*far objects clearly, blurred vision close up
uneven curvature of the cornea
loss of accommodation, unable to focus on near objects
*appears around age 40
What 3 structures are physical barriers to dust and foreign particles?
Which cranial nerve opens the eyelid?
CN III (oculomotor)
Which cranial nerve closes the eyelid?
CN VII (facial)
"pocket" under the eyelid
"whites" of the eyes
*collagen fibers; protect internal structures
What are the 6 layers of the cornea?
moistens the eye and provides oxygen to the cornea
colored part of the eye
allows light into the eye
rods and cones
dim or darkened environment
Which area of the retina provides the sharpest visual acuity? Why?
fovea centralis; center of the macula, made of densely packed cones
What type of drug is used often to treat glaucoma?
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