With aberrometry, it is possible for the first time to determine errors of refraction of the whole eye. Aberrations (deviations from the ideal optical image formed) which diverge incoming light beams from the ideal path, are determined, and the resulting data is used to define special ablation profiles (ZYWAVE, PROWAVE, WASCA) for the Excimer laser, allowing the defect to be corrected.

An aberrometer is a device that records errors in image formation by means of a high number of measuring points that are projected into the eye. The resulting map (wave front) exactly indicates the refractive power of the cornea at each point of measure. This permits determination not only of spherical and cylindrical errors, but also of other effects which may decrease the quality of the image (so-called higher-order aberrations). Based on these data, an ablation profile is then calculated for the laser, and the resulting correction performed on the cornea optimizes the global refraction of the eye. Current experience confirms that in certain cases visual acuity per se can be increased with the wave front technology.
  

• Correction of higher-order refraction errors that cannot be corrected with glasses or contact lenses
• Avoidance of errors resulting from pupil opening, to avoid glare at night, in case of large pupil diameter
• Improved contrast vision through reduction of eye aberrations
• Correction of alterations from previous laser corrections
    

ZYWAVE™ ZYOPTIX by BAUSCH & LOMB
Personalized Laser Vision Correction

Besides aberrometric data, this device features an iris camera that records the structure of the
iris as personalized data (biometric iris identification).

Together with the iris data, the recorded visual defect data allow a precise, punctual treatment of the visual defect of the eye.

More detailed information is found on www.zyoptix.com/zyoptix_uk/

WASCA Analyzer by CARL ZEISS MEDITEC
The innovative Aberrometer

The core is a high-resolution sensor with a total of 1452 measuring points (ca. 800 points in a 7 mm
pupil) to analyze the wave front aberrations. A special auxiliary system ensures that even eyes with a very high aberration can be measured. Because of the extremely short measuring time of only 13 ms, any influence of eye movements on the precision of the measure can be ruled out.

More detailed information can be found on www.meditec.zeiss.com/