VISX Technology

Iris Registration

Achieve a new level of precision in treatment alignment with Iris Registration (IR) - the first FDA-approved, fully automated, non-contact method of alignment of the correct CustomVue treatment to the corneal site. Using sophisticated algorithms and multiple reference points on each iris, IR ensures delivery of the treatment to the correct area of the cornea. It also enables you to instantly re-register in the event of intra-operative cyclotorsional movement. In addition, IR also correctly centers treatment independent of pupil center migration. Complete alignment confidence delivered. Automatically.

• Greater alignment accuracy
• Non-contact when aligning treatment
• Re-registration capability during treatment

• Creates a new level of confidence in the accurate placement of the correct treatment on the patient's eye
• Minimizes human error in aligning treatment
• Provides the physician with the ability to compensate for intra-operative movement

• Over 25% of patients achieve visual acuity that is one line better without glasses or contacts than their best corrected visual acuity with glasses before their treatment.
• 94% of CustomVue patients achieve a visual acuity of 20/20 or better.
• 25% of CustomVue patients achieve better night vision after their treatment.

WavePrint Map
Produced by the WaveScan device, the WavePrint map is a visual representation of how a patient’s entire optical system processes light. It allows for a more precise and detailed analysis of a patient’s vision and is used by the doctor to ensure optimal treatment results. Like a fingerprint, the WavePrint map is completely unique to every individual.

Star S4 ActiveTrak 3-D Eye Tracker
It is a Laser-positioning device that uses infrared cameras to actively follow the tiniest motions of the eye in all three dimensions. A patient can relax, knowing the laser system is actively following even the tiniest of eye movements, ensuring greater precision and accuracy during treatment.

Variable Spot Scanning (VSS)
An exclusive VISX laser technology that allows for a larger treatment area, VSS offers the doctor greater flexibility in developing a more individualized laser vision procedure.

What is VISX CustomVue?
VISX CustomVue is an individualized laser vision correction procedure that is Wavescan-driven. This enables the doctor to measure and correct unique imperfections in each individual’s vision. Many of these imperfections could never be measured before by standard methods used for glasses and contact lenses.

What is WaveScan technology?
Wavescan technology was originally developed for use in high-powered telescopes to reduce distortions when viewing distant objects in space. This technology has now been applied to laser vision correction, measuring imperfections in the eye 25 times more precisely than standard methods used for glasses and contact lenses.

Can CustomVue improve my night vision?
In the FDA clinical study, four times as many people were very satisfied with their night vision after the procedure as compared to their night vision before with glasses or contact lenses.

How Refractive (Wavescan) Errors Affect Your Vision
The cornea and lens of the eye focus rays of light by bending (or refracting) them to focus an image on the retina at the back of the eye, much like a camera focuses images onto film.

The above figure shows an ideal eye with no focusing imperfections. All of the rays of light traveling through the eye focus to a single point on the retina at the back of the eye.

In reality, all eyes have some degree of imperfections. One way to measure the focusing errors of an eye is to measure the wavefront of the eye. This can be done with an instrument like the VISX Wavescan Wavefront System. The wavefront map is a picture of the rays of light as they travel through the eye. The Wavescan System measures the wavefront errors by measuring light as it reflects out of the eye with a camera sensor.

The wavefront of a perfect eye has a flat surface because all of the light rays travel uniformly through the eye, as shown in figure1. The wavefront of an eye with imperfections is curved or wavy because some light rays reach the retina before others, and some rays strike different locations on the retina than others. Wavefront errors include both simple and complex focusing errors. The simple wavefront errors, which can be corrected with curved lenses (e.g., glasses or contact lenses,) are also called refractive errors and include myopia and astigmatism.

Myopia (nearsightedness) usually starts in childhood and gets progressively worse through adolescence. It usually stops changing by the late teens, but it can sometimes continue to get worse into the mid-twenties. Nearsighted (or myopic) eyes bend light too much so that light rays focus to a single spot in front of the retina. Things that are far away look blurry because the rays are spread apart instead of focused when they strike the retina.

Astigmatism causes the rays of light entering through different parts of the eye to focus unequally so that they do not ever form a single spot. Some rays may focus on the retina, but other rays focus in front of the retina. Things look blurry because images are not ever focused clearly on the retina.

The Wavescan System can also measure complex focusing errors. On the left in figure 4 is a map of all wavefront errors and on the right is a map showing just the complex errors. The combination of simple and complex wavefront errors in any eye is unique. The CustomVue Treatmetn is "custom" because it includes information form the Wavescan System that is more individualized than what a doctor uses to program a non-custom treatment.