Night Vision Disturbances
Patients undergoing LASIK procedures display an increase of halo phenomena around lights in night vision conditions, even when the results of the surgery are considered entirely satisfactory according to current international standards of predictability, efficacy and safety.
Studies have demonstrated that halo phenomena which interferes with night vision occurs even after successful LASIK procedures. Pupil size seems not to be important for the subjectively perceived night vision distortion, with spherical‐like, coma and secondary astigmatic higher order aberrations being the most significant predictors of post-surgical halo phenomena low-light conditions even when LASIK procedures are considered successful.
Different forms of night vision disturbance have been described among patients who had undergone refractive surgery procedures. Symptoms include starbursts to a typically transient loss of transparency in the postoperative period (haze), while halo phenomena will be caused by the margin of corneal ablation within the pupillary area.
It is difficult to distinguishing different forms of NVD by patients and their practitioners. NVDs include glare disability, decrease in visual contrast sensibility, and image degradation.
Night vision disturbances can be very successfully countered with Laserfit scleral lenses. Particularly beneficial is the use of our custom wavefront guided optics that are ground into our lens surface at time of manufacture. This allows us to effectively counter specific aberrations, essentially eliminating night vision disturbances for most patients.