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25 Cards in this Set
- Front
- Back
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What percentage of the outside surface of the eyes does the sclera cover? |
80 |
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True or false. the sclera provides an exoskeleton of the eye, attaches to EOMs and provides a surface of attachment for intraocular tissues (directly or indirectly) |
True |
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What are conduits of the sclera that allow for entry and exit of all vessels and nerves that enter or leave the eye |
Emissaria |
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What is downfall of emissaria? |
Provides easy path for intraocular Muscles to reach orbit |
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The internal scleral sulci is defined as |
Transition area over which a change in curvature occurs between cornea and sclera. The internal scleral sulci houses TM and schlemma canal |
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Where is the sclera thickest? |
At optic nerve called the intrascleral canal 1mm thick The sclera also supports the periphery of the cornea as well called the circumcorneal annulus (collagen fibrils) |
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When the eye ruptures due to blunt trauma what are the sites that are most commonly detached? |
Rectus muscle insertions where the sclera is thinnest recall SLIM 0.3mm |
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What causes buphthalmos |
Increase IOP in the young eye as in congenital glaucoma |
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True or false. As you age the sclera becomes loose and more permeable |
False it becomes more rigid and less permeable |
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True or false. As you age the sclera becomes loose and more permeable |
False it becomes more rigid and less permeable |
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When do you get hyaline plaques? |
After age 80 and thinning of sclera |
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What causes scleral opaqueness? |
Irregular fiber orientation, fully hydrated gags and thick fibers |
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The thin layer of pigmented tissue on the inner surface containing elastic tissue is called |
Lamina fusca |
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The dense irregular collagen layers that constitute the bulk of the tissue is |
Scleral strome |
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The LPCA may loop within the sclera near surface, anterior to the muscle insertions and form a small focal bulge surrounded by uveal pigment with a slate blue coloration is called |
Axenfeld loops |
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What separates episclera from conjunctival stroma? |
Tenons capsule |
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The episclera is made up of two layers of vessels called |
Superficial layer Which does move if you move the conjunctiva deep layer which does not move if you move the conjunctiva |
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The episclera is made up of two layers of vessels called |
Superficial layer Which does move if you move the conjunctiva deep layer which does not move if you move the conjunctiva |
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Inflammation of the superficial layer causes |
Episcleritis |
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Inflammation of the deep layer scleral vessels causes |
Scleritis which causes a lot of pain |
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Inflammation of conjunctival stroma causes |
Conjunctivitis |
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Episcleritis can be treated (whitened) ____. It will not improve Scleritis nor its associated pain |
2.5% phenylephrine |
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Veins from episclera receive ______what from schlemms canal |
Aq humor |
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Which layer does not move if you move the conjunctiva |
Deep |
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What is the fibroascular layer of the surface of the sclera known as |
Episclera |
