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55 Cards in this Set
- Front
- Back
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The 3 layers if the eye are... |
Fibrous (protective) tunic, vascular ( nourishing) tunic, nervous (light sensitive) tunic |
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What makes up the fibrous tunic? |
Sclera and cornea |
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What are the 5 layers of the cornea? |
Epithelium,bowman's membrane, stroma, decements membrane, and endothelium |
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Descemets membrane lies between the _______ and ______ |
Endothelium, stroma |
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Keeps the cornea clear by removing water (like a pump) |
Endothelium |
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What 3 things make up the vascular tunic? |
Choroid,ciliary body, and iris (cci) |
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is embedded with tiny muscles that help control the light levels in your eyes? |
Iris |
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What are the 2 muscles that control the light levels in your eye called? |
Dialator and sphincter muscles. |
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What lies between the retina and the sclera? |
Choroid |
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Connects withe ciliary body, towards the front if the eye AND edges the optic nerve in the back of the eye? |
Choroid |
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Where does the ciliary body sit? |
Behind the iris |
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What does the ciliary body produce? |
Aqueous humor |
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What does the ciliary muscles do? |
Contracts and relaxes the crystalline lens. |
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What are the fibers that run from the ciliary body to the chrystaline lens? |
Zonules |
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The ______ suspend the crystalline lens |
Zonuals |
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Changes in the shape and thickness of the lens cause an increase in the refractive power of the eye is called____________. |
Accomodation |
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The eyes process of changing it's focusing distance from near to far and vice versa. |
Accommodation |
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The nervous tunic consists of the ________. |
Retina |
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Where does light meet its final destination? |
The retina |
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Contains millions of photoreceptors |
Retina |
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What are the 2 types of photoreceptors? |
Rods and cones |
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How many rods are there? |
120 million |
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How many cones are there? |
6 million |
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What part of vision are the rods responsible for? |
Night vision and peripheral vision |
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What part of vision are the cones responsable for? |
Detail and color |
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What 3 colors are the cones? |
Red blue green |
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Where are the cones and rods contained at? |
In the macula |
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The very center part of the macula? |
Fovea |
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To see color, how many of the cones do you have to excite? |
2 |
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Name the 3 chambers of the eye |
Anterior chamber , posterior chamber, and vitreous chamber |
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Located between the cornea and the iris |
Anterior chamber |
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Located between the iris and the crystalline lens |
Posterior chamber |
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Located between the crystalline lens and the retina. |
Vitreous chamber |
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Greatest volume of the eye (about 4/5) |
Vitreous chamber |
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Flows between the lens and iris and thru the pupil into the anterior chamber. |
Aqueous humor |
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Maintains IOP and provides nutrients |
Aqueous humor |
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What is the main purpose of the aqueous humor? |
Maintain ocular pressure and provide nutrients to the lens, pupil, and iris. |
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Greatest volume of the eye? How much space does it occupy? |
Vitreous chamber 4/5 of the eye. |
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The vitreous chamber is filled with this thick like gel? |
Vitreous humor |
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Where floaters occur |
Vitreous humor |
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Acts as a storage area for nutrients and absorbs pshock to protect the retina |
Vitreous chamber |
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What is the protective sac around the eye called? |
Tenons capsule |
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What is the index of refraction for the aqueous humor? |
1.33 |
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What is the resting power if refraction of the crystalline lens? |
1.42 |
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What is the ring of fibrils around the known as (hint: there are 2 answers) |
Zonule of Zinn Suspensory ligaments |
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Where does the highest concentration of rods and cones in central zone of the retina occur? |
The mácula |
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How wide is the macula? |
2mm |
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What is the very small are (1/4mm) in the center of the macula called? |
Fovea |
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Does the fovea contain rods or cones? |
Cones therefor is know as the area with the most acute vision. |
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The small area around the point of the exit is know as the______. |
Optic disc |
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The optic disc is void of any rods and cones and is known often referred to as the _______. |
Blind spot |
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What is the palpebra? |
Eyelid |
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What is conjuctiva? |
Lubricated membrane that allows for easy movement of the eye lid. |
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These glands continually secret tears |
Lacriminal glands |
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These ducts continually drain the tears from the eye. |
Lacriminal ducts |
