Term
| What are conjuctival cysts filled with |
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Definition
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Term
| What are conjuctival concretions and who is likely to get them |
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Definition
- small yellow white nodules the size of a pinhead located in tarsal conj
-elderly get them, can get them removed if giving foreign body sensation |
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Term
| Conjuctival lymph vessels are located within the submucosa and drain into the lymphatics of the eyelids. Where do the lateral aspects drain? The medial aspects? |
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Definition
Lateral -- Parotid
Medial -- submandicular (m's go together) |
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Term
| What is the term for edema of the conjuctiva |
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Definition
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Term
| Pinguecula is modified conjuctiva in intrapalpebral areas from what sublayer |
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Definition
Submucosa.
1. Hyalinization 2. abnormal elastic fibers |
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Term
| Pterygium is a fibrovascular overgrowth of what kind of conjuctiva |
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Definition
Bulbar. It is surgically removed when 1. apex approaches visual axis
2. signficant corneal astigmatism is induced
3. cosmesi |
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Term
| Where are the stem cells located for the palpebral con? The bulbar conj? |
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Definition
Palpebral -- mucocutaneous junction
Bulbar -- Limbus |
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Term
| What vitamin can help to increase number of goblet cells |
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Definition
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Term
| What layer of the conjuctiva are the immune cells located? |
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Definition
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Term
| What structure suspends the lens from the CB |
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Definition
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Term
| How is the posterior lens attached the anterior vitreous |
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Definition
| Hyaloid capsular ligament = gives circular ring adhesion |
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Term
| Is the anterior or posterior surface of the lens steeper |
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Definition
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Term
| What is the refractive power of the lens |
|
Definition
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Term
| Why is there not a posterior epithelium on the lens |
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Definition
| Posterior cells become primary lens fib ers and eventually the embryonic nucleus |
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Term
| Where does the cell mitosis occur in the lens |
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Definition
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Term
| Where can the newest lens fibers be found? Deep or superficial? |
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Definition
| Superficial. Deepest = oldest |
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Term
| Where is the highest concentration of crystallins found in the lens |
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Definition
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Term
| What is the number one risk factor for cataract formation |
|
Definition
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Term
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Definition
| The random and interwoven pattern of collagen bundles are irregular and induce light scatter |
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Term
| How many mm is Tenon's Capsule posterior the limbus? |
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Definition
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Term
| What is the thinnest area of sclera? The weakest? The thickest? |
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Definition
Thinnest = 0.30mm under recti tendons
Weakest = Lamina Cribosa
Thickest = 1.0 mm Posterior Pole |
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Term
| What three structures make up the uveal tract? |
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Definition
| Iris, Ciliary Body, Choroid |
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Term
| Where does the blue eye color come from? |
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Definition
| The wavelength results from light scatter caused by arrangement and density of CT components (less pigment in anterior border layer) |
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Term
| What could a congenital heterochromia be due to? |
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Definition
| Disruption of sympathetic innervation. Remember Horner's syndrome is associated with heterochromia |
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Term
| Where is the Major Circle of the Iris located? |
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Definition
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Term
| Is the sphincter muscle located in the CB or the Iris? Is it sympathetic or parasympatetically inntervated? |
|
Definition
Located in Iris STROMA
Innervated by SPCN = parasympathetic --> P.S. Parasympathetic. Stroma. SPCN. |
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Term
| Where is the dilator muscle located? Is it parasympathetic or sympathetic? |
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Definition
Dilator is behind the sphincter muscle, terminates @ midpoint of sphincter.
Innervation: Sympathetic -- |
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Term
| What is the ora serrata the transition between? |
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Definition
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Term
| What muscle has dual innervation from both the parasympathetic and sympathetic systems? What is this muscle used for? |
|
Definition
Ciliary muscle
Parasympathetic causes contraction and sympathetic is inhibitory
Accommodation |
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Term
| The major arterial circle of the iris is from anastomosis of what two arteries? |
|
Definition
LPCA & ACA (this makes sense, @ the front of the eye = anterior, and the arteries that come from behind have to be long)
Remember the aqueous humor also comes from the bloodstream via the fenestrated capillaries of the Major Arterial Circle of the Iris |
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Term
| What layer of the ciliary body is involved in active secretion of the aqueous the serves as a diffusion barrier between the blood and the aqueous? |
|
Definition
| Non pigmented ciliary epithelium |
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Term
| The choroidal stroma contains both Haller's layer and Sattler's layer, which layer has larger vessels? |
|
Definition
| Haller's layer --> You gotta "haller" before you "S(e)attle" |
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Term
| Choroidal melanoma is the most common primary intraocular tumor in adults. What layer of the choroid has high melanin and vascularization that provides a prime spot |
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Definition
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Term
| Is the Hyaluronic Acid most concentrated in the periphery or in the center of the vitreous |
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Definition
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Term
| What layer is just interior to the vitreous cortex |
|
Definition
| Intermediate zone. Fibers on periphery are parallel to the cortex and central fibers are parallel to cloquet's canal |
|
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Term
| Where does Cloquet's canal terminate? |
|
Definition
| Area of Martegiani = funnel @ ONH |
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Term
| What is the significance of lipofuscin in the RPE |
|
Definition
| they contain degraded products of phagocytosis. |
|
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Term
| What structure connects the inner and outer segments of photoreceptors? How are the outer segments oriented? |
|
Definition
Cilium
Tip is oriented toward RPE and base toward inner segment |
|
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Term
| What two cells do PR synapse with |
|
Definition
| Bipolar and Horizontal cells |
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Term
| Where is the outer nuclear layer thickest |
|
Definition
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Term
| Where is the deep capillary network located? The superficial network? |
|
Definition
Deep = INL
Superficial = NFL |
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Term
| Which bundle in the NFL determines VA |
|
Definition
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Term
| Which layer of the retina is responsible for retinal sheen |
|
Definition
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