Monday, 18 May 2009

PRK photorefractive keratectomy

It's hard to believe these days, when everything is "LASIK (laser), which PRK (photorefractive keratectomy by its initials in English) used to be the refractive surgery procedures and more common with 95 effectiveness. Although both procedures are grouped under the umbrella of "laser eye surgery," each one is slightly different advantages and disadvantages when it refers. With LASIK surgery patients have less discomfort and obtain good vision faster (PRK with the improvement is gradual and can be in a few days or even months), but it is important to note that many surgeons prefer PRK for patients with thin corneas.
PRK The technique was invented at the beginning of the decade of the'80s. In 1995 was approved by the FDA as safe laser technique for correction of problems of myopia, hyperopia and astigmatism, but the procedure is practiced in other countries for years. In fact, many Americans were performed before surgery in Canada would be available in the United States.
PRK is performed with an excimer laser, which uses a cool beam of ultraviolet light to precisely remove (the "ablation") very tiny bits of tissue from the surface of the cornea in order to reorganize and get a clear vision without glasses or lenses Contact. To reshape the cornea in the right way, works to focus light into the eye and the retina, providing clearer vision than before. Persons with myopia, hyperopia and astigmatism can benefit from PRK. In patients with myopia, the goal is to flatten the cornea too steep, also, the excimer laser can correct astigmatism by smoothing an irregular cornea of normal form.
Before surgery
If you are considering PRK, the first step is to choose a surgeon of recognized standing and active member of any College of Surgeons in your country. Your doctor will do a thorough examination of your eyes to determine exactly what type of vision correction needed and the need for laser ablation. A corneal topography will be vital, through which photographs are taken of the eye and creates a "map" of your cornea. Nobody has a perfectly rounded cornea, and the surveyor showing the irregularities of the cornea and the plate that the surgeon should be corrected with the excimer laser. It should also be practiced a Pachymetry which is a study that measures the thickness of the cornea, ie the distance from the front or rear surface of the epithelium or endothelium. You have to be subjected to a series of laboratory tests to know their health conditions and analyze the feasibility of surgery. Some conditions may disqualify a candidate PRK completely, others can mean a deferral of the proceedings of special attention.
During surgery
PRK is an outpatient procedure and fast, you go out walking to the surgery center. In fact, the surgery usually takes less than a minute, and you'll be awake all the time. On rare occasions, the doctor will provide a mild oral sedative. Most people do not feel pain during PRK. if you visit Israel, you must and book online with Israel Maven His eyes are the only anesthetized with special drops. After anesthesia, your eye is placed directly under the laser. (One eye is operated at a time.) A type of retainer is placed over the eye to keep your eyelids open normally, this is not uncomfortable. It has a suction ring that keeps your eye pressurized and immobile. The doctor uses a computer to adjust the laser for their particular requirements. You will be prompted to focus their gaze on a ray of light for a short time while the doctor looks through the eye of a microscope to make sure it stays in the correct position while the laser sends pulses of light to your cornea, which eliminates the imperfections in the cornea. It is important to keep its eyes fixed on the fixing of the light beam in order to obtain the best results. The laser machine will make a constant sound while the laser pulses are occurring, and may feel a slightly sour odor during the extraction of tissues. Do not worry, it's normal. After completion of surgery, you put soft contact lenses for a period not exceeding five to six days to help the regeneration and protection of the fabric, which will be retired at the end of the period indicated. The greater need correction, the longer the surgery will take. A doctor may prescribe medication for postoperative pain, but many people do not feel that way to a mild discomfort in the eye of basurilla. Besides desinflamatorios prescribe eye drops and antibiotics to prevent infection.

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May 18, 2009 6:41:21 AM

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