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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