PRK
(Photorefractive Keratectomy)
PRK was the first procedure developed to reshape the cornea using a laser. The major difference between PRK and LASIK (which was developed later) is that during PRK, the epithelium (outer layer of the Cornea) is scraped away to expose the stroma (middle layer of the cornea), while in LASIK, a flap is cut in the epithelium.
LASIK
(laser-assisted in-situ keratomileusis)
LASIK is a surgical procedure which uses a laser to help improve vision and reduce the patient’s dependency on glasses or contacts. LASIK uses a precision laser to alter the shape of the cornea. During the procedure, a mechanical microkeratome (a precision blade device) or a laser keratome (precision laser device) is used to cut a flap in the epithelium, the outer layer of the cornea. This flap is then folded back to reveal the stroma for computer controlled correction. The flap is then folded back into place.
After surgery, various side effects can occur, most of which are part of the normal healing process. These include itchiness and dryness of the eye, light sensitivity, fluctuations of vision and glare. The surgery can also have more serious complications, which include over and under correction in vision, neovascularization, opacity and haze formation. Many of these side effects may disappear with time, but approximately 30% of patients require additional surgeries to correct these problems.
TheraKine's EpiKine™ is targeted to help quicker, more predictable healing after LVC surgery.
For more information on LVCs, their benefits and potential side effects, see:
The Food and Drug Administration's page on LASIK surgery
Medicinenet's page on laser surgeries