Corrective eye surgery

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Last seen on: Universal Crossword – Nov 25 2021

Random information on the term “Corrective eye surgery”:

Automated lamellar keratoplasty (ALK), also known as keratomileusis in situ, is a non-laser lamellar refractive procedure used to correct high degree refractive errors. This procedure can correct large amounts of myopia and hyperopia. However, the resultant change is not as predictable as with other procedures.

ALK uses a device called a microkeratome to separate a thin layer of the cornea and create a flap.

The eye is anesthetized and a ring is fixed to it in order to keep it properly positioned and flat. The microkeratome then makes a small incomplete flap across the cornea by cutting across it. While still attached at one side, the corneal flap is folded back to reveal a sub layer of cornea.

At this point, the microkeratome is precisely readjusted to match the calculated cut depth for the patient’s vision correction. The calculation is based on the patient’s glasses and contact lens prescriptions. The surgeon then passes the microkeratome completely over the eye making the power cut. After the power cut, the corneal flap is laid back over the eye where it reattaches.

Corrective eye surgery on Wikipedia

Random information on the term “LASIK”:

Diffuse lamellar keratitis (DLK) is a sterile inflammation of the cornea which may occur after refractive surgery, such as LASIK. Its incidence has been estimated to be 1 in 500 patients, though this may be as high as 32% in some cases.

Patients typically present within one week of surgery with eye pain, photophobia, conjunctivitis, or excessive tear production.

DLK is predominantly associated with Lasik, as the creation of a flap creates a potential space for cells to accumulate. Individuals with atopic conditions with pre-existing allergic conjunctivitis, or ocular rosacea, are more prone to developing the condition after surgery. Some authors have reported that moderate to severe eye allergies and chronic allergic conjunctivitis are an absolute contraindication to the LASIK procedure. This is in distinction to findings of earlier studies. Keratitis can also occur after photorefractive keratectomy (PRK), although because it occurs in the setting of infection, it is distinct from the sterile infiltrates of DLK. DLK can also occur following myopic keratomileusis, in which a disc of corneal tissue is removed, shaped and sutured back into place, although this technique is more historical, having been replaced by Lasik and PRK.

LASIK on Wikipedia