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18 Cards in this Set
- Front
- Back
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Normal hydration of cornea is
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78%
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Corneal hydration is controlled by
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epithelium, endothelium and IOP. But the PRIMARY structure in maintaining proper corneal hydration is the endothelium
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T/F The PRIMARY structure in maintaining proper corneal hydration is the epithelium
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FALSE
endothelium -->prevents excessive movement of fluid from aq into corneal stroma by active transport pumping mechanism |
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If stroma thickness increases greater than __ epithelial edema results
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30%
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T/F Early EPITHELIAL edema does not cause significant VA redution, but STROMAl edema does cause significant VA reduction
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FALSE!!
Early STROMA edema does not cause VA reduction EPITHELIAL does. |
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T/F Epithelium can regenerate
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True
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T/F Endothelium can regenerate
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FALSE
so stromal edema following endothelium loss is PERMANENT and serius. |
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______ edema is more responsive to topical hyperosmotic therapy than stromal edema
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epithelial
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Topical hyperosmotic agents include
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sodium chloride
gylcerin glucose |
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Soidum choloride is available in
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solutions
ointments and topical use 1-2 drops every 3-4 hrs |
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sodium chlroide is most effective when _____- is intact
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epithelium, questionable alue when it is breached
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Commerical solns of sodium chloride are
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Adsorbanac
Muro-128 AK-NACL |
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Glycerin exerts its osmotic effect by
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absorbing water.
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T/F 100% glycerin will not cause significant tissue damage
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true
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Corneal edeam clears in ______ minutes when using glycerin
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1 to 2 minutes
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T/F instillation of glycerin causes pain
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T
first instill topical anesthetic!! |
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Commerical produce available for hlycerin is
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Ophthalgan
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_____ solutions of glucose are effective inreducing corneal edema
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30-50%
40% soln is comparable to 5% NaCl in reducing edema |
