If you’ve ever thought about getting corrective eye surgery, then it’s most likely because you hate wearing glasses or any kind of correction like contact lens. There are, in fact, several different methods of eye surgery to correct your impaired vision, which include laser assisted in-situ keratomileusis (LASIK), photorefractive keratectomy (PRK), laser assisted epithelial keratomileusis (LASEK), and wavefront LASIK. Co-dydramol there are actually several others, but some of these are either outdated or are currently undergoing clinical trials to approve of its validity.
Probably the most well known corrective eye surgery is LASIK. LASIK usually takes less than 5 minutes to perform so it is a fairly quick procedure. Before surgery, numbing drops are instilled in the eye and then a retainer is placed between your eyelids to keep your eyes open. None of these steps should be uncomfortable to you. During the actual procedure, surgeons use an instrument called a microkeratome or a femtosecond laser to cut out a thin, circular flap of the cornea. Once the flap is cut out, a laser is used to permanently reshape the cornea, after which the flap can be reattached. Due to the nature of this surgery, LASIK is also known as ‘flap and zap’.
Photorefractive keratectomy (PRK) is one of the older methods of corrective eye surgery. Unlike LASIK, PRK only uses a laser. This laser is more precisely known as an excimer laser as it is really a chamber in which there is argon and fluorine gas. Under extreme pressure and high voltage, the 2 gases combine to produce argon-fluoride molecules. These molecules break down, which in turn emit extremely high-energy radiation. This radiation is sufficient to cause any biological macromolecule to fall apart when absorbed and this process is called photo ablation. If you do try out PRK, then you’ll be able smell a burned-tissue scent and hear a snapping sound when the procedure is being performed.
LASEK is similar to LASIK in a way – both involve cutting out a flap of cornea followed by applying laser energy to reshape the cornea then reattaching the flap. However, LASEK is used only for patients with very thin corneas or corneas that are too steep for LASIK. Also, LASEK involves cutting out a very thin layer of the cornea, known as the epithelium, and not all of the layers of the cornea. Instead of a retainer to hold your eyelids, an alcohol solution is used to loosen up the epithelium. The surgeon then uses a tiny hoe to lift epithelial flap and then the excimer laser is applied. The flap is then resealed.
Wavefront LASIK uses 3D measurements of your eye to determine the precise amount of reshaping needed to correct your specific needs. To build the 3D map of your eye, a wave front machine is used to transmit rays of light into your eye. These rays of light are reflected off the back of your eye, back through the pupil and into the device where the reflected light is received and analyzed. All visual irregularities within your eye are transferred to the laser and then computer matched to your eye’s position to allow accurate corrective eye surgery to be performed by the surgeon.
These are some of the better known corrective eye surgeries right now. Of course, there will always be certain complications and post-surgery procedures that you can follow to minimize adverse effects and maximize your newly corrective state.