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  Lasik Laser > Wavefront C-LASIK  
   
 
It is now possible to detect and measure aberrations in the optical system of the eye by wavefront analysis. In principle a highly collimated deam of light is incident on the retina, the reflected beam suffer deviations due to aberrations. The deformation caused to this wavefront is measured and analysed by an instrument called aberrometer.

After the wavefront data has been acquired and analyzed to measure the aberrations the information is used to tailor the Laser ablation pattern for the patient to eliminate these aberrations. Experience has shown that giving one standard Lasik ablation treatment to all the patients based on their refractive error alone has limitations and problems. Unpredictability of results, glare, halos, reduced contrast sensitivity, decreased scotopic vision and aggravation of aberrations are often seen with conventional Lasik. Many ways have been tried to customize Lasik to suit a particular patient.

In wavefront guided Lasik guided Lasik i.e. ZYOPTIX not only the topography data generated by the Orbscan is fed into the Lasik machine but also the aberrometer data.
  
     
 
  • Advantages
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    Wavefront guided Lasik have some definite advantages:

    •  Better results: 14% patients achieve visual acuity of 6/3 and more than 50% patients had their visual acuity     increased   by one line. There are decreased complications like glare, colored halos, diminished contrast sensitivity,     poor scotopic   vision, central islands, bumps, etc.
    • It is less invasive in the sense that lesser amount of tissue ablation required to achieve given effect.
    • It is useful in post Lasik patients to deal with complications, post Keratoplasty patients to deal with complex     astigmatism, and may even be useful in apparently normal individuals whose professions demand a very sharp     vision.
    		  
         
     
  • Limitations
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    Exact centeration of the eye required both during aberrometery and during Lasik with exact correspondence between and during Lasik with exact correspondence between the two. This is achieved by using the same centering and tracking mechanisms.

    Aberrations vary with the degree of accommodation, thus, aberration profile measured and corrected for distance vision may not be applicable for near vision.

    Aberrations change with age, so, the benefit may decrease with advancing age.

    It is not known what would happen to these eyes when they develop cataract and are operated for the same by implantation of IOLs.

    The regression changes on aberrations are not known.

    High cost of equipment and the procedure.
    		  
         
         
         
         
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