The VISX Iris Registration Technology

As a part of the VISX CustomVue wavefront-guided laser vision correction procedure, accurate alignment of the treatment to the cornea is essential for optimal outcomes. 

• Iris Registration Technology replaces previous methods of attaining accurate alignment, which required the physician to manually place ink marks on the white part of the eye called the sclera.
• Iris Registration is a hardware and software product enhancement that is a seamless upgrade to the VISX WaveScan WaveFront System and VISX STAR S4 Excimer Laser the technology that drives the CustomVue procedure.
• Iris Registration Technology is a non-contact method of aligning the treatment to the cornea that provides greater laser alignment accuracy.
• Unlike manual, ink-based alignment methods, Iris Registration Technology is not time sensitive, and allows the physician to re-register alignment even if the treatment has been paused or the eye has moved.
• Iris Registration enables the physician to image the iris and creates a new level of confidence in the accurate placement of the correct treatment on the patient’s eye.

The Key Patient Benefits of VISX Iris Registration Technology

• It’s normal for the pupil to shift positions from the point of wavefront measurement to the point of treatment.
• Accurate alignment is essential to optimizing customized wavefront-guided ablations, and the VISX Iris Registration Technology makes it easer than ever with a fully automated method.
• When the CustomVue procedure is performed, the Iris Registration Technology centers the treatment correctly, independent of changes in the pupil center from measurement to treatment.
• VISX Iris Registration Technology makes it easier than ever to achieve accurate alignment with a fully automated, touch-free method of measuring and marking the eye.
• Iris Registration Technology can save procedure time.

How does VISX Iris Registration Technology work?

One set of measurements are taken with the patient seated at the WaveScan, and another set taken with the patient lying down on the laser bed. Then, the technology employs a five-step iris registration process:
      1. The system finds and unwraps the iris.
      2. The system then selects prominent reference points for each iris.
      3. Using a set of sophisticated algorithms, the system finds multiple matching reference points for each iris.
      4. The system then calculates the treatment surface angles from multiple matching reference points.
      5. Iris Registration Technology then automatically checks the solution quality.