Quote:
Originally Posted by ftngirsh
Some who was being treated for PK mentioned "bow tie astigmatism." (I don't know what PK is either. I always thought "PK" meant "Preacher's Kid.")
Anybody know what "bow tie astigmatism" means?
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On a website called "flapandzap.com" it shows an example of "bow tie" astigmatism. It's when the shape of the cornea resembles that of a bow tie (below).
According to Wikipedia, the old standby, PK is "penetrating keratoplasty" and here's how it's done:
On the day of the surgery, the patient arrives to either a hospital or an outpatient surgery center, where the procedure will be performed. The patient is given a brief physical examination by the surgical team and is taken to the operating room. In the OR, the patient lies down on an operating table and is either given general anesthesia, or local anesthesia and a sedative.
With anesthesia induced, the surgical team prepares the eye to be operated on and drapes the face around the eye. An eyelid speculum is placed to keep the lids open, and some lubrication is placed on the eye to prevent drying. In children, a metal ring is stitched to the sclera which will provide support of the sclera during the procedure.
A trephine (a circular cutting device) is then placed over the cornea and is used by the surgeon to cut the host cornea, which removes a circular disc of the patient cornea. The trephine is then removed and the surgeon cuts a circular graft (a "button") from the donor cornea. Once this is done, the surgeon returns to the patient's eye and removes the host cornea.
The donor cornea is then brought into the surgical field and maneuvered into place with forceps. Once in place, the surgeon will fasten the cornea to the eye with a running stitch or a multiple interrupted stitches. The surgeon then reforming the anterior chamber with a sterile solution injected by a cannula, then testing that it's watertight by placing a dye on the wound exterior.
Antibiotic eyedrops placed, the eye is patched, and the patient is taken to a recovery area while the effects of the anesthesia wear off. The patient typically goes home following this and sees the doctor the following day for the first post operative appointment.
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06-04-2008, 04:19 PM
What is "Bow Tie Astigmatism"?
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