Term
What portion of the globe of the eye does the cornea form? |
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Definition
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Term
How many layers does the cornea have? What are they? |
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Definition
Four.
1. Epithelial Cells 2. Substantia Propria
3. Elastic Lamina 4. Endothelial Cells |
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Term
During corneal transplant surgery, what part of the cornea is replaced? |
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Definition
Only the central portion of the cornea is replaced. |
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Term
What is done to the donor cornea to ensure a proper fit? |
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Definition
It is sized 0.1mm larger than the recipient opening. |
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Term
What kind of tests are done on the donor tissue? |
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Definition
Test for presence of communicable diseases. |
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Term
What is important for the tech to do prior to induction of anesthesia? |
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Definition
Confirm that the donor cornea is arrived. |
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Term
What is used to verify the correct size of the donor cornea? |
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Definition
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Term
Which surface of the donor cornea is placed facing upward on the punching block? |
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Definition
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Term
What is used to punch the donor cornea to the correct size for placement? |
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Definition
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Term
What type of traction sutures are used, where are they placed, and why are they placed? |
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Definition
-4-0 Silk traction sutures.
-Placed at the insertions of the superior and inferior rectus muscles.
-Steady the eye while the graft bed is prepared. |
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Term
What is a trephine used for? |
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Definition
Placed on patient's cornea and used to make the corneal cut around the cornea, and into the anterior chamber. |
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Term
| If the trephine cut is not complete, what can then be used to finish the cut? |
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Definition
| Corneal Scissors or Diamond Knife |
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Term
What can be used to hold the graft in place while it is sutured into the bed? |
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Definition
Temporary indirect sutures. (Tensioned once graft is placed) |
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Term
What is used to suture the graft in place? What is the procedural consideration for the ST? |
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Definition
10-0 polyamide (Nylon). ST may be asked to moisten suture with saline before passing to the surgeon. |
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Term
Why is BSS/acetylcholine solution injected in to the anterior chamber of the eye once the graft is sutured in place? |
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Definition
To ensure the wound is watertight. |
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Term
What is the final step before dressings?
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Definition
Antibiotic drops instilled, traction sutures removed.
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Term
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Definition
Antibiotic impregnated gauze, an eye pad, and a shield. |
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Term
When will the body usually reject a cornea graft? |
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Definition
Rarely within 2 weeks, and as late as 20 years later. |
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Term
T/F
Transplants due to scarring of the cornea from infections typically have a higher success rate. |
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Definition
False
Transplants due to abnormally shaped corneas or corneal clouding have a higher success rate, than those due to scarring from infections. |
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Term
What is the wound classification? |
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Definition
Class I: Clean Contaminated |
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