Term
What 4 layers make up the cornea? |
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Definition
1) epithelial cells 2) substantia propria 3) elastic lamina 4) endothelial cells |
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Term
What is the function of the cornea? |
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Definition
To allow light into the eye, and to bend light rays to help the lens focus them upon the retina. |
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Term
What happens to our corneas with age? |
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Definition
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Term
What are some leading causes of clouding of the cornea? |
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Definition
1) eye injuries that leave a white scar (penetrating wounds, fire, chemicals) 2) bacterial, viral, or fungal infections that lead to scarring 3) corneal dystrophies 4) inherited corneal diseases 5) cataract or other eye surgery |
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Term
During corneal transplant surgery, which part of the cornea is replaced? |
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Definition
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Term
In which 2 forms may corneal donor tissue arrive from the eye bank? |
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Definition
1) arrives as a whole eye, or: 2) arrives as prepared and sized cornea buttons |
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Term
What might the surgeon request for the preparation of a donor cornea? |
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Definition
A separate, sterile table. |
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Term
What is used to store the donor corneal button? |
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Definition
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Term
Which drops may be instilled after general anesthesia is induced? |
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Definition
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Term
Which communicable diseases may be present in the donor tissue? |
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Definition
hepatitis, HIV, Cruetzfeldt-Jakob Disease |
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Term
What is the purpose of the 4-0 silk traction sutures placed at the insertions of the superior & inferior rectus muscles? |
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Definition
Used to fix and steady the eye while the graft bed is prepared. |
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Term
What is the function of a "trephine"? |
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Definition
It is placed on the cornea and is used to make the corneal cut around the cornea and into the anterior chamber. |
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Term
Before passing 10-0 polyamide to the surgeon to suture the new graft in place, what might s/he ask you to do with it? |
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Definition
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Term
After the graft is placed, why is BSS or acetylcholine solution injected into the anterior chamber through a fine cannula? |
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Definition
The cannula ensures that the wound is watertight. |
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Term
What dressing will most likely be used to protect the post operative eye? |
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Definition
antibiotic drops, eye is covered with antibiotic-impregnated gauze, an eye pad, & a shield. |
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Term
Prior to the induction of anesthesia, the surgical technologist should always confirm that ____ has arrived. |
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Definition
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