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43 Cards in this Set
- Front
- Back
Repairs quickly from trauma Damaged surface cells will regenerate within 24 to 48 hours Entire cornea repairs in 7 days with no future tramua |
Epithelium |
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Surface cells migrate to fill damaged area and more internal cells forward |
Epithelium |
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Cells hold together with Cement like substance |
Epithelium |
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5 to 7 layers thick 3 types of cells |
Epithelium |
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Epithelium has 3 types of cells Inner, Middle, Outter. What is the inner cell made of |
Tightly packed columnar cells/ basal cells which attach to basement membrane aka Bowman’s layer |
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Epithelium has 3 types of cells Inner, Middle, Outter. What is the middle cell made of |
Slightly columnar cells becoming wing cells |
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Epithelium has 3 types of cells Inner, Middle, Outter. What is the Outter cell made of |
Superficial squamous cells/flat overlapping cells |
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Derives Nutrition primarily from Air and tear film |
Epithelium |
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Epitheliums Primary function Two defintions |
Protection from internal structures Stabilization of the preocular tear film and maintaining a barrier to fluid and microorganisms. |
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Sheet of transparent tissue/ 10mm thick |
Bowman’s layer |
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Sheet of transparent tissue/ 10mm thick |
Bowman’s layer |
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Provides Barrier to most Molecules |
Bowman’s Layer |
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Sheet of transparent tissue/ 10mm thick |
Bowman’s layer |
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Provides Barrier to most Molecules |
Bowman’s Layer |
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Damage will produce fibrous scar tissue |
Bowman’s Layer |
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Extremely Tough |
Bowman’s layer |
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90% of total thickness of Cornea and consists of finely layered collagen fibrils 30 um in diameter |
Stroma |
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Absence of blood vessels contributes to its transparency |
Stroma |
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Dependent upon proper hydration |
Stroma |
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Collecting additional fluids will interrupt the regular structure and produce edema and clouding of the tissue |
Stroma |
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6% or greater edema will greatly reduce transparency creating posterior striae |
Stroma |
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I’m greater swelling of 10% or more posterior folds are produced |
Stroma |
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Nutrition is primarily through diffusion through the endothelium from the aqueous humor |
Stroma |
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Both proper fluid balance and nutrition can be influenced by the contact wearer |
Stroma |
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Ulcers produced by bacterial, viral, or fungal infections or involving deep layers may take months to heal. |
Stroma |
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Ulcers produced by bacterial, viral, or fungal infections or involving deep layers may take months to heal. |
Stroma |
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Stacked lamellae extending from limbus to limbus running parallel to the surface and to each other. |
Stroma |
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Loosely attached by short fibrils from the stroma |
Descendent’s Membrane |
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Loosely attached by short fibrils from the stroma |
Descemet’s Membrane |
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True Basement Membrane |
Descement’s Membrane |
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Resistant to penetration |
Descement’s Membrane |
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Trauma, intraocular surgery, inflammation of poorly fitting contacts may cause temporary folds to develop |
Descement’s Membrane |
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It will retain the shape of the storms when changes (occur due to edema or other causes of corneal shape alteration causes striae) |
December’s Membrane |
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Posterior limiting layer that is 8- thick |
Descemet’s membrane |
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Most interior layer |
Endothelium |
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20 mm wide Located at the posterior of the cornea |
Endothelium |
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Comprised of a single layer |
Endothelium |
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Mostly hexagonally shaped cells about 4 to 6 mm thick |
Endothelium |
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It forms a barrier between the aqueous humor and corneal stroma |
Endothelium |
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We are born with these cells 400,000 none are developed through life |
Endothelium |
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Primary function to maintain corneal transparency by removing excess fluids from the corneal interior by acting as a metabolic pump |
Endothelium |
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Removing waste from the stroma and maintaining the relative deturgescence (dryness) of the cornea |
Endothelium |
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If not working properly water will migrate into cornea, corneal clouding will develop, causing blurred vision. It may develop to the point where the surface forms blisters that intermittently rupture; causing sharp pain. |
Endothelium |