A device for establishing a desired alignment between a patient's eye and
a laser system to facilitate an engagement therebetween includes a light
source to illuminate the eye. A moveable platform is provided to move the
patient relative to the laser system. To establish alignment between the
eye and the laser system, a reference marker is based on the laser
system. An image of the marker, along with reflections from the
illuminated eye, is then transmitted to the system controller. There, the
image and reflections are processed to determine a measured alignment
that is then compared to the desired alignment. An error signal that is
indicative of an alignment difference is then generated and used to
incrementally move the platform, or the patient, in an appropriate
direction.