Wavefront Customized LASIK
When you go to an eye doctor or optician, they will give you a prescription for spectacles, typically specifying the sphere and cylindrical refractive error, along with the axis of the cylinder. Most people assume that that is the entire refractive error of the eye.
But in fact, the sphere and cylinder are only the lower order refractive errors (or the lower order optical aberrations of the optical system of the eye). Certain higher order aberrations (which go by esoteric names as coma, trefoil, and spherical aberration) also exist in the optical system of the eye. These cannot be measured easily. An instrument, called a wavefront aberrrometer, is used to measure these.
Higher order aberrations cause very fine and small degradations in the optical quality. Their values are pupil size dependent. Higher order aberrations are generally small in value when the pupil size is small (as in good light), and have a higher value when the pupil size is large (as in dim light or in the dark). Therefore higher order aberrations generally cause more difficulty in night vision than during the day.
Recently (i.e. in the last 5-7 years), methods have developed which allow excimer lasers to treat higher order aberrations of the eye. Before the year 2000, wavefront aberrometers were not easily available instruments (they were too big, too complex and too expensive to work outside a typical research setting). Now they are available rather easily. Wavefront aberrometers give a unique set of aberrations for each patient (both the lower order-i.e. the sphere and cylinder as well as the higher order aberrations). When data from the wavefront aberrometer is used to generate a treatment pattern by the excimer laser, this is known as wavefront customized LASIK.
New Vision Laser Centers offers customized treatments at most of our centers. As a very good alternative, many of our centers offer Wavefront-Optimized LASIK also. The aim of Wavefront Optimized LASIK is not to induce aberrations into the eye during the LASIK procedure. Since most people do not have too many higher order aberrations in virgin (i.e. unoperated) eyes, they do not need a treatment of higher order aberrations using wavefront customized LASIK. In these patients, wavefront-optimized LASIK which seeks to maintain the aberrations to a bare minimum, is quite sufficient. Wavefront-Optimized LASIK is also called OptiLASIK or Aspheric LASIK.
At New Vision, we do not charge extra for Wavefront-Optimized LASIK or Aspheric LASIK. This is our standard treatment. In addition Bladeless LASIK treatments induce less aberrations into the eye than standard LASIK treatments.
In ReLEx smile, the nature of the procedure is such that there is hardly any induction of aberrations into the eye after ReLEx smile. ReLEx smile is by default, wavefront optimized.
See also: Topography Customized LASIK or Topolink