Cornea Flashcards
What uses ultraviolet energy at 193mm which vaporizes anterior corneal tissue by breaking molecular bonds?
Photorefractive Keratectomy (PRK)
What is used to clean interface foreign bodies beneath the lasik flap?
Syringe of filtered BSS with a small gauge cannula
What are the lasik complications?
Lamellar incision too short
Lamellar incision too long
Lamellar incision poor quality
Corneal perforation or amputation
What is the procedure that removes partial surface corneal opacification where underlying healthy corneal layers exist?
Lamellar PKP
What procedure is the full thickness PKP technique where the central host cornea is removed completely, exposing the cavity of the globe?
Open Sky PKP
What solution is the donor cornea placed in before the procedure?
OptiSol (to check the PH)
Pink is a normal PH
What degenerative lesion of the bulbar conjunctiva is a result of a chemical change in tissue from radiant UV light exposure?
Pingueculae
How should the donor tissue be placed in the TEFLON PUNCH BLOCK?
Epithelial side down, so cell loss will not be incurred
What is the TREPHINE used for and what sizes does it come in?
To punch the donor tissue from the endothelial side
0.2 to 0.5 mm larger then the recipient measurements
The larger the corneal rim the what?
Better post operative optical performance, faster recovery, less chance that irrregular astigmatism will develop
The narrower the donor rim the more likely what?
Post operative vessel ingrowth to the sutures, suture loosening, peripheral anterior synechiae, glaucoma and graft rejection
What is the typical rim size of a donor button?
2 mm width
What surgical procedure where the damage cornea tissue is replaced with a donor corneal tissue?
Penetrating Ketatoplasty (PKP)
What is an incisional corneal keratotomy procedure that utilizes radial incisions placed in the peripheral 2/3 of the cornea at approximately 95% corneal depth?
Radial Keratotomy (RK)
How long can a donor tissue be stored?
7 days postmortem
