Many people who are tired of wearing glasses or contact lenses seek the help of refractive surgeons. Refractive surgery improves vision by correcting refractive errors such as nearsightedness (myopia), farsightedness (hyperopia) and astigmatism.
|Myopia, also known as near-sightedness and short-sightedness, is a condition of the eye where the light that comes in does not directly focus on the retina but in front of it, causing the image that one sees when looking at a distant object to be out of focus, but in focus when looking at a close object.|
|Hyperopia or hypermetropia, also known as farsightedness, is a defect of vision caused by an imperfection in the eye (often when the eyeball is too short or the lens cannot become round enough), causing difficulty focusing on near objects, and in extreme cases causing a sufferer to be unable to focus on objects at any distance.|
|Astigmatism is an optical defect in which vision is blurred due to the inability of the optics of the eye to focus a point object into a sharp focused image on the retina. This may be due to an irregular or toric curvature of the cornea or lens|
METHODS OF LASER VISION CORRECTION
Femto LASIK is one of the best, most precise, safest and gentlest procedures in the field of modern eye correction and has replaced classic LASIK as the state-of-the-art treatment for visual impairments.
The advantages of Femto LASIK
- Uniform, smooth, straight corneal flap
- Tissue-sparing cornea removal
- Precision in the treatment
- Gentler and virtually pain free
- Faster visual recovery
- Generally results in full sharpness of vision the following day
- No interruption of blood flow to the retina
- Simple procedure in a safe, sterile environment
The eye operation or lasering occurs in three steps:
Step 1: The corneal flap is prepared within a few minutes with the femtosecond laser (“bladeless” LASIK). Thanks to individual, personalised wavefront treatment (aberrometer/wavefront technology) with iris recognition, the laser is adjusted for each eye. The precisely and gently prepared flap is lifted. Now the actual laser surgery begins.
Step 2: The excimer laser individually corrects the refractive error for each eye, using the data provided by the computer-aided wavefront analysis, which takes incredibly precise measurements. The modelling of the cornea begins.
Step 3: The flap is then carefully closed and now acts like a natural plaster, re-growing by itself.
2. LASIK (LASER IN SITU KERATOMILEUSIS)
LASIK is the most common laser eye surgery. LASIK starts with the creation of a thin flap in the cornea. Your surgeon uses a blade or a laser to make this flap. Once the flap is created, the excimer laser is used to reshape
the cornea, which corrects the refractive error.
3. PRK (PHOTOREFRACTIVE KERATECTOMY)
PRK is the second most common type of laser eye surgery. PRK starts with the removal of a portion of surface of the cornea or epithelial tissue. There is therefore no need for flap creation, and the removed tissue grows back. Some patients prefer PRK because they don’t want a corneal flap, and some patients are better candidates for PRK eye surgery than for LASIK (for instance, people with thin corneas). Once the epithelium is removed, a laser is used to reshape the cornea. The laser is the same (i.e., excimer) as the one used in LASIK. The PRK recovery period is a bit longer than that of LASIK.
Your ophthalmologist should be able to determine from a comprehensive, laser-eye-surgery-specific eye exam which procedure is best for you. His recommendation will follow which procedure he thinks will give you the best possible outcome. Most patients achieve 20/20 or better vision after laser eye surgery.
LASER VISION CORRECTION F.A.Q.
AM I A CANDIDATE FOR LASER VISION CORRECTION SURGERY?
Candidates for Laser Vision Correction should be 18 years or older with stable vision, healthy eyes and a prescription that falls within the range of effective treatment. In some cases, such as CustomVue™ (Wavefront -Guided) treatments patients should be 21 years of age or older. You will need an initial evaluation, followed by a comprehensive eye exam to help you and your doctor decide which procedure is right for you. Laser Vision Correction can benefit a great number of people with myopia, hyperopia, and astigmatism. Candidates should have a strong desire to be less dependent on corrective lenses and willing to accept the risks of surgery.
DOES LASER VISION CORRECTION HURT?
No, the procedure is painless. Anesthetic eye drops are placed in the eye to numb it. Most patients say they feel some pressure during the procedure, which only lasts a few seconds. After the procedure you may have some light sensitivity, tearing or “burning” in the eyes, which should subside after a few hours. These symptoms are temporary.
WILL I BE ABLE TO SEE RIGHT AWAY?
Most patients will notice improvement in vision immediately following treatment. Visual recovery varies for each person, but usually stabilizes at 1 month. The speed at which your vision improves is due to individual healing rates, type of procedure and degree of nearsightedness, farsightedness or astigmatism. Most patients find that their eyes feel fairly normal within a day. However, vision can continue to improve and best vision can take two to three months to occur. If necessary, enhancements can be done after your vision has stabilized to further improve your vision. Patients who have hyperopic LASIK may have a longer healing process.
WHEN CAN I RETURN TO WORK?
It depends on your occupation. Most patients go back to work and resume their daily activities within one to three days following LASIK. Your doctor will discuss any activities you should avoid immediately after your treatment.
WILL I HAVE 20/20 VISION AFTER LASIK?
An overwhelming majority of patients achieve vision which enables them to perform most of their daily activities without the need for glasses or contact lenses.
WHAT IF MY EYE MOVES DURING THE PROCEDURE?
The VISX STAR S4™ Excimer Laser has a tracking system which follows the eye during the laser treatment. If any large eye movements occur, the laser automatically stops. Once the eye is repositioned the physician will resume the laser treatment to the appropriate area of the cornea.
HOW LONG DOES THE LASER VISION CORRECTION PROCEDURE TAKE?
The whole procedure takes about 10-15 minutes for two eyes. This includes anesthesia to the eye(s), creating the flap and performing the laser treatment.
CAN BOTH EYES BE TREATED AT THE SAME TIME?
Due to the advanced technology used to perform Laser Vision Correction, both eyes are usually treated on the same visit, one right after the other.
DOES INSURANCE COVER LASER VISION CORRECTION?
Most vision insurance companies still see Laser Vision Correction as an elective procedure. A few insurance companies have added Laser Vision Correction to their benefits. You can contact your insurance company to determine if your policy contains a Laser Vision Correction benefit.
WHAT ABOUT NIGHT TIME VISION AFTER LASIK?
Glare, halos and ghosting (which may become most noticeable at night) were not uncommon side affects of many laser procedures early on with the use of older technology. Most likely, if you did not have any glare, halo or ghosting issues before Laser Vision Correction, you will most likely not have those issues after the procedure. Modern lasers have very much reduced this problem. Ask your doctor about your individual risk.
DO THE RESULTS LAST?
Laser Vision Correction is considered to be a permanent procedure. However, it will not prevent any age-related conditions, such as presbyopia or cataracts. They would need to be treated in the usual manner.
CAN LASIK CORRECT MY CLOSE-UP VISION?
Typically, after age 40, we develop a condition known as the decreased ability to focus at near. The progressive loss of the accommodative (focusing) ability of the lens is due to the natural processes of aging. Presbyopia usually begins to occur around the age of 40 and is commonly corrected by the use of reading glasses or bifocals. LASIK will not correct your reading vision. LASIK only corrects nearsightedness, farsightedness or an astigmatism. If you wear bi-focals or wear contacts in addition to your reading glasses, LASIK may eliminate your need for bi-focals or contacts but you will still require reading glasses after the procedure.
ARE THERE AGE LIMITATION?
In general, the ideal candidate for LASIK is between the ages of 18 and 55, with stable vision and healthy corneas. Although this is the optimal age range, we have performed the procedure on patients up until age 60.
HOW MANY CHECKUPS WILL I NEED AFTER LASIK?
Depending on your surgeon, you will probably return the next day, then one week or one month later and then three months later. Your doctor will let you know if more visits are necessary.
DO I HAVE TO BE WITHOUT MY CONTACTS BEFORE SURGERY?
Contacts actually change the natural shape of your cornea. In order to achieve the most accurate measurements possible, you will need to discontinue your contacts before your pre-op exam and until surgery. This allows your cornea to relax and resume its most natural shape for the laser measurements. If you wear soft contact lenses, you will need to stop wearing your contacts 2 weeks prior to the dilated exam and until the procedure.
WHAT IS THE DIFFERENCE BETWEEN THE TRADITIONAL LASIK AND CustomVue LASIK?
The difference between the Traditional LASIK and CustomVue™ LASIK procedures is how we obtain your measurements and how the excimer laser reshapes the cornea.
You might consider WaveScan CustomVue™ an upgrade in laser vision correction. The LASIK procedure is essentially performed the same as Traditional. However, the pre-operative work-up differs for CustomVue™ due to the use of the WaveScan machine. During your pre-operative exam, we will use a wavefront analyzer (WaveScan™) to generate a WavePrint™ map which details visual properties unique to your eyes. It is this added technology which creates a customized laser treatment which is then programmed into the laser for your procedure. The actual LASIK procedure is performed identically to Traditional LASIK by creating a corneal flap, reshaping the cornea with the laser, then laying the flap back in place. Recovery time is the same for both types of LASIK. However, CustomVue™ patients tend to have a better quality of vision with less occurrence of side effects such as nighttime glare or halos.