The decision for laser treatment is often due to the problems that occur while wearing contact lenses or simply the desire to be independent from glasses and to see properly. If the patient is given good advice including the potential risks involved, the chances of success are high.
Unfortunately, like any other medical procedure, some laser surgery is unsuccessful, unexpected side effects can lead to unsatisfying visual results. For example vision can be affected by an irregular corneal surface, or because the patient was poorly adviced. Fortunately, this percentage is very small; however for those affected that’s of no of consolation.
Often, these corneal situations are very complex. An additional difficulty is the fact that the treatened area of the cornea has become strongly thin.
Choosing a contact lens with the correct geometry can restore or at least greatly improve the vision.
LASIK and other eye laser procedures involves the reshaping of the eyes natural refractive system by removing tissue from the anterior surface of the cornea. Occasionally this can lead to corneal irregularities, which can decrease the quality of vision compared to the vision the patient used to know with spectacles or contact lenses prior to the laser-treatment being carried out, for example, it may lead to a natural myopia, which then needs to be re-corrected.
This kind of myopia and other irregularities can be re-treated by follow-up-laser surgery. But if the cornea has become too thin for a second laser treatment, or there are other problems – the best choice would be to fit a contact lens to increase the quality of vision.
During laser treatment, the central area of the cornea is irreversible flattened to dress the patient’s myopia. This leads to an important transformation of the corneal surface and consequently a greater challenge when fitting a contact lens compared to an eye with natural geometry.
Consequently regular contact lens geometries will not fit a post Lasik cornea and they cannot center properly. Also regular contact lenses fitted to a post Lasik cornea leads to unstable and blurred vision and patient discomfort.
In these cases it is recommended to choose a special post Lasik design (“HydroMed“) soft contact lens. The geometry of this new kind of design is significantly flatter in the center than in the periphery (its called reverse-geometry), and is suited to the corneal geometry found in Post Lasik patients
Special measuring instruments are recommended to determine exact “point-to-point” measurements of the post-operative anterior corneal surface to thereby define the best possible fitting geometry and correction. These measuring instruments, called corneal topographers, are used in clinics to measure the cornea before the operation takes place.
The desire to see well without glasses always exists! From about 45 years of age, presbyopia becomes noticeable and you cannot avoid reading glasses. Multifocal contact lenses offer the possibility to read without glasses and to work on the computer without losing vision at longer distances.