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Our World Class Technology
Home|About AccuVision|Our World Class Technology

World-Class Wavefront Technology for Laser Eye Surgery

The FS200 Femtosecond laser

The FS200 Femtosecond laser is a fourth generation device that builds on experience from earlier lasers and represents the finest technology available. It focuses thousands of tiny laser spots inside the cornea, the spots joining together to create a perfect continuous cut. This ‘no blade’ technique provides an alternative treatment to mechanical devices and is used by our specialist surgeons when appropriate to do so.

The FS200 Femtosecond laser

The Alcon WaveLight EX500 Excimer laser

The world-class Alcon WaveLight EX500 Excimer is  the fastest excimer laser in the world today and is seen as a major advancement in laser treatments. Located in London, it incorporates numerous technical advances including multi-dimensional eye-tracking, online pachymetry (measurements of cornea thickness made during the treatment), superfast small flying-spot ablations (‘Perfect Pulse Technology’) and three customisable Wavefront Correction platforms: 'Wavefront Optimized' and 'Wavefront Corrected' for distance vision and ‘Custom Q’ for reading vision – one of which will be suitable for the customised treatment plan you will require to gain clearer vision.

At Accuvision, advanced wavefront technology as part of the the treatment plan comes as standard. Many patients believe they see better than they did with glasses or contact lenses after experiencing wavefront laser eye surgery with us.

For further details click here

The Alcon WaveLight EX500 Excimer laser

WaveLight Allegretto Eye-Q 400 Hz

Accuvision uses the WaveLight Allegretto Eye-Q 400 Hz custom excimer laser in the Birmingham and Leeds clinics. Its speed and accuracy results in it reducing the treatment time by 10-20% compared with other lasers undertaking similar treatments. Together with the Tscherning wavefront analyzer, through its in-built prolate profile enhancement, the WaveLight Allegretto produces superb clinical outcomes for patients receiving Wavefront laser eye surgery.

Unlike standard lasers, the WaveLight Allegretto Eye-Q 400 Hz custom excimer laser produces a rounded, sharply-focused profile measuring only a fraction of a millimetre across. This enables the surgeon to smoothly remove the tiniest amounts of corneal tissue with the highest degree of accuracy. This laser is also able to use the high resolution data compiled during the patient consultation to produce much larger, more regular treatment zones, vastly improving night vision results. Patients with large pupils can be treated with the utmost efficacy.

Laser Eye Surgery Platform

Some key features associated with the WaveLight Allegretto Eye-Q laser  include:

  • The WaveLight Allegretto is one of the fastest eye correction laser available in the world today. 
  • To correct one dioptre of vision takes just two seconds.
  • The precision and speed of the excimer laser is achieved through PerfectPulse Technology™. Every laser pulse is completely controlled from the moment it is created to where it meets the eye.
  • Each ultra-thin laser pulse is used to sculpt the corneal surface of the eye with the utmost precision.
  • Safety is built in to the Allegretto laser through its Smart Energy Control. After the laser beam has been created, it passes through three checkpoints on its way to your eye. At each of these points, the energy level is checked and adjusted if necessary, to ensure that the beam is perfect before reaching the eye.
  • Eye movement during treatment is a concern to many patients. The Allegretto has built-in Eye Tracking Technology. The eyes position is measured every 4-6 milliseconds, that's 200 times per second. Before any laser pulse is released a final check is made a fraction of a second before. If, for any reason the eyes move, the laser will automatically stop and wait for the eye to return to the correct position for further treatment.
  • Wavefront-optimised technology is used to create a large optical zone by automatically compensating for the curvature of the cornea. Incorporated into the technology is a system that adjusts for the individual curvature of the patients' cornea so that a larger optical zone is created during laser eye surgery, whilst maintaining the spherical shape of the eye. Problems with poor night vision, glare and halos are thereby avoided leaving the patient with the very best visual outcome.

With recent advances in technology our laser procedures are safer, faster and more effective than ever before. You can see our audited results for laser eye surgery here.

Find out more about the Allegretto laser and Alcon WaveLight.

Understanding the precise condition of your eyes is of paramount importance before any treatment is recommended and that is why we undertake a comprehensive consultation to provide you with the very best options for your condition.

The Aberrometer

To correct vision using laser eye surgery we must first determine the individual irregularities of the eyes that limit the quality of the retinal image. Light rays enter the eye as flat sheets known as wavefronts. If the optical system is perfect (which is unusual), these wavefronts exit the eye as regular, flat sheets.

When the cornea or other components of the optical system have imperfections, higher order aberrations are created, causing the wavefronts to exit the eye as irregular curved sheets of light. These irregularities or aberrations in the way the light exits the eye can now be measured and recorded using a device known as the 'aberrometer'.

Wavefront Technology - WaveLight Diagrams

Wavefront Analyzer

Wavefront technology is used to measure both lower and higher order aberrations (visual imperfections in the eye's optical system). By addressing all aberrations we are able to offer a laser eye surgery treatment that will give you the very best results possible. The way it works is as follows:

A grid pattern of rays of light are passed through your eye using a computerised wavefront measuring instrument (the WaveLight Analyzer). As the light waves travel through your eye's optical system, the imperfections in the eye distort the grid pattern. The Analyzer captures the image of the grid pattern on the retina at the back of the eye, and then calculates the imperfections within the eye by how much the grid has been distorted from a perfect arrangement.

A three-dimensional map is then produced representing the unique visual distortions in your eye, including both the lower and the higher order aberrations. The information contained within the map is then transferred to the WaveLight Allegretto Wave excimer laser, to be used to guide the laser as it reshapes the cornea during laser eye surgery, providing you with a perfectly customised laser vision treatment.

Wavefront Allegro Topolyzer

The basis for a successful assessment of visual disorders is an accurate diagnosis. The ALLEGRO Topolyzer has been specifically designed to measure and generate high resolution data for eyes with severe irregularities. It was developed for the most difficult cases for laser eye surgery, in which standard wavefront measurement would prove clinically ineffective. The Topolyser not only provides exact data on the overall topography but also delivers exceptional clarity of data around the periphery of the cornea.

With an extraordinarily high resolution of the cornea resulting from 22,000 measuring points and a large placido disc, the ALLEGRO Topolyzer is an incredibly accurate tool for the examination of the most complicated vision disorders and is able to accurately identify Keratoconus and also has a pupillometry reading.

WaveLight Allegretto Excimer Laser

The WaveLight Allegretto excimer laser is the most advanced laser available for laser eye surgery and the only laser to have been built right from the start for custom procedures. It is the only laser that currently accepts data from the Pentacam device to add another custom laser eye surgery procedure to our treatment options.

WaveLight Allegretto Excimer Laser

Eye Tracker

The built-in multi-dimensional eye tracker offer exceptional precision and safety

Eye Tracker
  • Movement tracking every 2 milliseconds
  • Dynamic pupil tracking from 1.5 to 8.0mm
  • Active pupil centering

PerfectPulse Technology®

PerfectPulse Technology
  • PerfectPulse Technology® maintains a high pulse frequency with minimum thermal load.
  • Additional pulses maintain an even distribution of energy throughout the treatment zone.
  • Reduces potential for night time halos and glare.


The Pentacam is now established as the premium device to obtain and interpret corneal information that is of visual significance. It is especially good at providing the clearest and highest quality of data from the central part of the cornea. 

Wavefront Technology - WaveLight Allegretto Diagrams

Wavefront Technology - Pentacam

The Pentacam uses a sophisticated Scheimpflug camera system that scans the anterior eye (cornea, anterior chamber, iris, and lens) and takes up to 25,000 measured data points in a scan time of 2 seconds per eye. From all this data a 3D model of the eye is constructed that can be viewed and analysed by the surgeon. This information helps ensure the recommendations for laser eye surgery will be as safe as possible. The 3D capability of the image can also help identify if lens implants for very near or far-sighted patients might be a better option than laser surgery.

Custom Laser Treatments For Short Sight FDA Trial Results

**Best results in bold type

Laser Type WaveLight Allegretto Wavefront Optimised WaveLight Allegretto Wavefront Guided VISX S4 Low Short Sight VISX High Short Sight Baush & Lomb Zyoptix
UK clinic using this laser Accuvision Accuvision      
Year of FDA trial 2006 2006 2003 2005 2003
% of patients with 20/20 vision
** Higher = Better
92.8% 93.4% 93% 84.3% 91.5%
% of patients with better than 20/20 vision
** Higher = Better
75% 63.9% 73.6% 65.2% 70.3%
% of treatments that were very accurate
**Higher = Better
95.2% 94.6% 90.3% 77% 75.99%
% of treatments that were moderately accurate 100% 99.3% 99.3% 95.5% 93.8%
Comparison of typical vision before to after: % not as good
**Lower = Better
14.8% 13.9% 20.9% 21.9% 21.8%
Comparison of typical vision before to after: % same or better
**Higher = Better
85.2% 86.1% 79.1% 78% 78.2%
Measure of small degree loss of vision
**Lower =Better
2% 2% 8.7% 6.5% 5.9%
Measure of gain in best vision possible 98% 98% 91.3% 92.5% 94.1%
% of patients needing second treatment
**Lower = Better
0% 2.7% 3.4% 2.2% Not Reported

**Best results in bold type
**All results are at six months - the results are publicly available at www.fda.gov
**WaveLight Allegretto used at Accuvision clinics outperforms all other lasers