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                  | To correct 
            nearsightedness, the cornea must be made flatter. This is 
            accomplished by removing tissue from the center of the cornea
 To treat farsightedness, the central cornea must be made steeper. 
            This is accomplished by directing the laser beam to remove tissue 
            from around this area.
 To correct 
            astigmatism, the cornea must be made more spherical. By changing the 
            pattern of the beam, more tissue is removed in one direction than 
            the other. |  |  | 
        
        
          
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    |    
    Precise Analysisof Your
 Unique Vision
 
 
 
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    | Like your finger print, your CustomVue Map is 
    unique to you |  
    | The CustomVue Map is derived from technology first developed to correct 
    distortions of light waves from space. This allows researchers to accurately 
    view images of stars and planets.
    The CustomVue Map uses the same technology to measure light waves as they 
    travel through your eye.
 
 Without a tracking device, laser vision correction requires patients to hold 
    their eyes perfectly still during the process. However, even a "still" eye 
    makes minute, involuntary movements, including slight movement with each 
    breath. The 3D ActiveTrak follows the most specific movement 
    instantaneously, repositioning the laser automatically to ensure laser 
    accuracy.
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