Eye Surgery Results

Eye Surgery Results at David Gartry

Not only do we achieve excellent outcomes with our routine laser eye surgery but we also successfully perform treatments on patients with highly complex prescriptions and carry out remedial work for patients referred from other clinics that do not have the experience to deal with such cases.


At David Gartry’s clinic careful analysis of results / outcomes is crucial to providing an ongoing professional and informed service for our patients. Patient data are meticulously gathered and entered into the state of the art IBRA (Internet Based Refractive Analysis) database. IBRA allows a comprehensive analysis of refractive and visual data after LASIK, LASEK, PRK, clear lens extraction, cataract surgery, corneal cross-linking and corneal ring segment implantation. IBRA also provides access to a large global reference database which can assist surgeons to refine their techniques and fine tune the programming of the lasers that they use for laser eye surgery and other treatments.

100% of patients with medium to moderately high myopic prescriptions (up to -6.00 dioptres) achieve 20/40 (6/12) unaided (the UK driving test standard) or better after primary LASIK or LASEK. Since the average prescription is around -4.00 dioptres, this means that almost all patients achieve a high level of unaided vision post-treatment. As can be seen below, the vast majority achieve 20/20 (6/6) or better unaided, and the small percentage of patients needing a ‘fine-tune’ (around 3.5% – usually those with higher than average prescriptions initially) also then achieve this high level.

Binocular Unaided Vision

For statistical purposes it is important to report the results of individual treatments, i.e. we report each eye separately, as explained above. However, in terms of patient satisfaction in managing well without spectacles or contact lenses in the real world, the vision achieved with both eyes open (the norm of course!) is more important. Where one eye sees a little less than the other the patient, obviously, functions well on the performance of the better eye. In fact, it is also often the case that one eye has always been dominant in the past and remains so post-treatment.

Where the 2 eyes individually achieve a very similar result after laser surgery (for example 20/20 in each eye) the unaided vision with both eyes together is often significantly better (20/15 or 6/5 – the Royal Air Force standard for its pilots!). This is the effect of binocular vision in which the brain takes the image from each eye and processes the information to increase the overall visual acuity. This is termed summation and means that “the whole really is more than the sum of the parts!”. The bar charts below reveal this increased level of binocular unaided vision following Lasik and Lasek. It is this level of vision that relates most closely to patient satisfaction and overall visual performance after the treatment.

David Gartry and his team use the well established IBRA software to examine patient’s visual outcomes over time.

The IBRA system has been created by Zubisoft GmbH, a Swiss company specialising in the development of high-end software for the medical industry. IBRA provides a unique platform to examine how patients fare after surgery.

Many clinics use generic company data and doctors typically might rely on laser technicians to interpret and analyse laser eye surgery results. David Gartry sees all of his patients at each visit after their surgery and closely liaises with his team to personally analyse patient results. He has an intimate knowledge of the patient database, the analysis of each patient’s results and also the subtle changes to laser programming (algorithm adjustments) that are essential in optimising results.

The team takes into account age, refractive error, how the laser has performed when treating similar patients in the past and occupation / exact visual requirements. This attention to detail is all aimed at getting the very best results for patients.

Christine Mackney heads up the coordination of the IBRA analysis and works closely with patients and David Gartry in collating patient outcomes.