Iris Registration
As part of a custom LASIK Wavefront mapping 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 non-contact method of adjusting the laser treatment to compensate for changes in pupil size, shift and eye rotation providing a more precise match to the measurements obtained in the office prior to surgery. It is the first fully automated method of aligning and registering Wavefront corrections for custom treatments.
 
One set of measurements are taken in the office with the patient seated at the WaveScan and another set with the patient lying down on the laser bed. Then the technology employs a five-step 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 solutions quality.
 
The accuracy of this technology is a dramatic improvement over any system that relies on humans to mark the cornea. For patients with significant amounts of pre-operative astigmatism, post-operative results show 50% less residual astigmatism with iris registration versus without.
 
Iris Registration adds another level of sophistication to Wavefront guided laser vision correction and further enhances the quality of vision we can achieve with this procedure.