An instrument called the Aberrometer maps the errors in the optical system of the eye [wavefront analysis], which is linked to the laser before treatment. The wavefront analysis is customized for the individual and hence offers the most ideal treatment available for the patient from all currently known vision correction procedures.

A square grid of 128 thin parallel and equidistant rays is projected into the eye.

The pattern of distortion of the regular grid determines the optical errors of the eye. In an aberration-free eye the grid pattern projected on the retina would remain unchanged and deviations of each spot when present are measured by means of a computer.

The Aberrometer captures five consecutive wavefront analysis measurements through a dilated pupil to map all the aberrations.

These maps are then used to generate a composite wavefront profile, which in turn guides the laser treatment profile and spot pattern.

Wavefront analysis-guided LASIK now makes it possible to treat a larger spectrum of patients. The WaveLight 500 Hz Concerto Laser offers individuals who are not entirely satisfied with their outcome of earlier treatments such as radial keratotomy [RK], PRK or even LASIK on first generation excimer lasers, the benefit of a topography-linked procedure [mapping the irregular corneal surface and making it regular]. This procedure gives the best possible uncompromised vision.