Advanced CustomVue™ LASIK
& Wavefront Analysis
Advanced LASIK Technology for Nearsightedness, Farsightedness and Astigmatism
New Advances in State of the Art LASIK... that everyone's been waiting for...
By combining three advanced technologies, ophthalmic surgeons have available a new refractive laser system. Using a small spot or scanning beam laser, eye tracking, and wavefront analysis, doctors are able to perform highly accurate and smooth sculpting of the cornea. The techniques provide the basis for more accurate, precise and predictable custom vision correction for a wider range of patients. In fact, in some patients, vision can be corrected to better than 20/20.
Our visual system has the potential of seeing 20/10 or better. Most people, however, can not see better than 20/20 due to subtle vision imperfections. Advanced CustomVue™ LASIK LASIK has the potential to reduce the effects of some of these subtle imperfections and to correct vision to better than 20/20. It also has an even lower potential than standard LASIK for complications such as night vision glare.
Advanced CustomVue™ Laser Correction
Early refractive lasers used a single, broad laser beam and vision improvement resulted from a general correction and reshaping of the cornea to treat myopia, hyperopia and astigmatism (lower order aberrations).
Where these lasers were only concerned with correcting refractive problems caused by a generally misshaped corneal surface, the new custom lasers can take into consideration higher order aberrations, (very subtle imperfections) to further improve vision. These aberrations are found within the eyes entire refractive system, including the lens, retina and cornea. A small spot or scanning beam excimer laser has the ability to correct one area of the cornea slightly different than another area of the cornea. In effective this new laser system can provide a vision correction pattern that is custom designed for the individual to reduce the effects of these higher order aberrations.
Using a sophisticated computer and mapping softwear, wavefront analysis essentially involves projecting a grid pattern into the eye and analyzing the integrity of its returned image for areas of displacement. As the projected image moves through the eye, it must pass through the cornea, the lens of the eye and be reflected back off the retina. If the pattern is returned exactly as it was sent, and in the predicted position, all aspects of the eyes refractive apparatus are functioning perfectly. However, if there is an aberration affecting refraction anywhere in the eyes visual system, it will show up in the returned image.
Hundreds of points within the central visual zone are analyzed. If areas are found where the pattern is out of position, distorted, incomplete or fuzzy, specific correction can be targeted to that corresponding location on the surface of the cornea.
Tracking Eye Movement
With early laser systems, eye movement was not a factor. Patients could hold their eye still during the procedure by starring at a fixation light on the laser. With the advent of Custom LASIK and precision lasers, however, small visually undetectable eye movements, called saccadic eye movement, became very important. These tiny, involuntary eye movements are impossible to predict or prevent. Systems like Laser Radar Tracking, developed during NASA's Strategic Defense Initiative, have been adapted to track this eye movement. Using special cameras, laser beams or radar, movement is detected in "real time" (thousands of measurements each second) and transmitted instantly, directing the laser to move in sync with the eye. The result is very accurate placement, smooth ablation (removal) of tissue and improved visual outcomes.
The Advanced CustomVue™ LASIK Procedure
After the eye is numbed using eye drop anesthesia for painless surgery, and while the patient lies on her/his back, a special instrument (a microkeratome) is applied to the cornea, creating a thin flap of corneal tissue. Eye tracking is then initiated to synchronize the laser with eye movement and the laser begins reshaping the cornea.
A computer, programmed by the doctor for each person's own correction factors, controls the laser and the sculpting of the cornea. In treating myopia, the laser segment of the procedure begins. As the laser moves across the surface, a concave lens is created over the visual axis. Next, the corneal flap is replaced (without stitches) and the LASIK procedure is complete.
With hyperopia, the shape of the cornea is essentially steepened to allow images to correctly focus on the retina. For astigmatism, the laser beam scans back and forth along the cylindrical axis to reshape the eye.
Advanced CustomVue™ LASIK usually takes less than 30 minutes and the patient leaves shortly after the procedure.
After Advanced CustomVue™ LASIK, the majority of people are able to pass a drivers license test without glasses or contacts. Many patients report an immediate improvement within the first day. Vision potential varies from one person to the next and a thorough Pre-LASIK evaluation is necessary to provide a good estimate of vision correction. Generally, however, most people are able to perform most routine activities like driving without glasses and with Custom LASIK, many people obtain 20/20 vision or better.
Advanced CustomVue™ LASIK is performed on an outpatient basis using and "eye drop" anesthetic to numb the eye for painless surgery. LASIK normally takes less than 30 minutes and the patient leaves shortly after the procedure. An eye shield may be placed on the eye for temporary protection and to keep you from rubbing your eye in your sleep. Medication drops are used to prevent infection and promote healing. After LASIK, patients usually return to their normal lifestyle quickly with very few restrictions during the short healing period.
Advanced CustomVue™ LASIK... Even Better than Standard LASIK
Is LASIK for Everyone?
To be eligible for LASIK the eye must be in good health and vision must be stable. However, some people are better candidates than others, and some may be better suited to another refractive surgery technique or a combination of techniques. Consultation with the doctor prior to surgery is important to determine estimated benefits and possible complications.