Laser eye surgery from ADVANCE VISIONCARE

Eye Tracker and Iris Recognition

At Advance VisionCare, we use sophisticated Multi-dimensional Eyetracking Technology, to detect the positional changes of the eyes, ensuring the patient's safety is maintained throughout the procedure. Our state of the art Laser, the Bausch and Lomb z100 and the Eyetracking Technology used at Advance VisionCare enables us to deliver the highest quality and most accurate treatment available today.

The patient is asked to look directly at a red light, and the video-based infrared camera communicates the information back to a computer to verify the positioning of the eye. The laser is adjusted accordingly before a pulse is fired. This is called a closed loop system, and is extremely sophisticated. The eye tracker is also both passive and active in its mechanism. This means that a certain range of eye movement will be compensated for (3mm), but beyond this amount of movement, the laser will cease to deliver a pulse. This provides a safety-lock mechanism to prevent any failures and also guaranteeing that the patient's safety is maintained at all times.

The new Multi-Dimensional Eyetracker on the Zyoptix z100 system has a few additional features. Whilst it still compensates for the undetectable small movements and/or stops laser from firing when the movement is too large and target becomes out of range, it also offers -

• A faster reaction time of 6.6 milliseconds
• The ability to not only track movements in the horizontal (x-plane) or vertical (y-plane) dimension, but also in the 3rd dimension (z-plane)
• The ability to compensate for more complex movements of the pupil and eye. In a small number of cases, pupils dilate/open up unevenly or eyes turn off-axis when you lie flat. The Eyetracker compensates for this automatically.

Like your fingerprints, no two irises are the same and this can be used to provide a unique identification. The Zyoptix z100 system can scan your irises during the Zywave measurement and maps the entire Iris, generating a unique digital Zy-ID for each eye. This map of the iris forms the foundation from which the Multi-Dimensional Eyetracker operates. The Zy-ID is the unique digital file that contains the patient treatment information, included the map of the Iris.

<< Back

For Your Information