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Visual and Auditory SystemsMedical-Surgical Nursing-7th edition

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What are the 8 components of the external structure of the eye?
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Eyelids, eyebrows, eyelashes, lacrimal system, conjunctiva, cornea, sclera, and extraocular muscles.
What are the 5 internal structures of the eye?
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Iris, lens, ciliary body, choroid and retina.
Where does the visual information refracted onto the retina get processed as an image?
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The occipital cortex
What makes up the outer layer of the eyeball?
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The sclera and the cornea
What is the middle layer of the eyeball called and what is in it?
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It is the uveal tract and is made up of the iris, choroid body and ciliary body.
What makes up the innermost layer of the eyeball?
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The retina
Where is the anterior chamber of the eyeball located?
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Between the iris and the posterior surface of the cornea.
Where is the posterior chamber of the eyeball located?
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Between the anterior surface of the lens and the posterior surface of the iris
What does the anterior and posterior chambers of the eyeball contain?
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Aqueous humor secreted by the ciliary body
Where is the vitreous cavity located?
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Behind the lens and retina
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What structures does light pass through in order to reach the retina?
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The cornea, aqueous humor, lens and vitreous.
What structure of the eye is most responsible for the majority of light refraction needed for clear vision?
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The cornea
What is the function of aqueous humor?
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It bathes and nourishes the lens and endothelium of the cornea.
What is glaucoma?
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Excess production or decreased outflow of aqueous humor that increases the intraocular pressure above normal (10 mm-21 Hg).
What structures support the ocular lens and keep it in place?
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Zonules
What is the function of the ocular lens?
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To bend light rays, allowing them to fall on the retina.
Accommodation, a process that allows a person to focus on near objects, is possible through modification of the lens shape. The ________ are the structures that make this occur.
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Zonules
Vitreous becomes more ___________ with aging.
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Liquid (it is normally a gelatinous substance)
Light passing through the vitreous may be blocked by any ___________ within the vitreous.
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Nontransparent substance
__________ is the ability of the eye to bend light rays so they fall on the retina.
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Refraction
  
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