Apparatus for calculation of ablation data on a cornea for refractive correction and apparatus for operation on a cornea for refractive correction

Abstract

An apparatus for operation on a cornea by ablating with a laser beam for correcting ametropia; the apparatus comprising an input device utilized for inputting each data necessary for correction, a first correcting device for irradiating a laser beam for correcting myopic astigmatism, a second correcting device for irradiating a laser beam for correcting hyperopic astigmatism, a calculating device for calculating each correction-data based on the each inputted data in case of combining the first and second correcting means, and a control device for ablating the cornea by controlling the first and second correcting means based on results calculated by the calculating device.

1 - 5 . (canceled)  
     
     
         6 . An apparatus for calculation of ablation data on a cornea of an eye for refractive correction to be achieved by ablating an optical zone of the cornea with a laser beam, the apparatus comprising: 
 input means for inputting data necessary for refractive correction of the eye;    calculation means for calculating ablation data for myopia correction to ablate a central portion of the cornea more and a peripheral portion of the cornea less, ablation data for hyperopia correction to ablate the central portion less and the peripheral portion more, ablation data for myopic astigmatism correction to ablate a portion of the cornea closer to a weak principal meridian more and a portion of the cornea farther from the weak principal meridian less, and ablation data for hyperopic astigmatism correction to ablate a portion of the cornea closer to a strong principal meridian less and a portion of the cornea farther from the strong principal meridian more; and    selection means for selecting one of myopia correction, hyperopia correction, simple myopic astigmatism correction, compound myopic astigmatism correction, hyperopic astigmatism correction, and mixed astigmatism correction,    wherein upon selection of the simple myopic astigmatism correction or the mixed astigmatism correction, the calculation means calculates both the ablation data for myopic astigmatism correction and the ablation data for hyperopic astigmatism correction based on the input data.    
     
     
         7 . The apparatus according to  claim 6 , wherein upon selection of the simple myopic astigmatism correction or the mixed astigmatism correction, the calculation means calculates the ablation data for myopic astigmatism correction using the following expression:  
           C   Myo   =|S+C |/(1 +X )  and calculates the ablation data for hyperopic astigmatism correction using the following expression:        C   Hyp   =|C|−C   Myo      wherein x is a ratio of change in a spherical component to be effectuated by the ablation data for myopic astigmatism correction, and the input data includes spherical power S and astigmatic or cylindrical power C of the eye.    
     
     
         8 . An apparatus for operation on a cornea of an eye for refractive correction to be achieved by ablating an optical zone of the cornea with a laser beam, the apparatus comprising: 
 input means for inputting data necessary for refractive correction of the eye;    calculation means for calculating ablation data for myopia correction to ablate a central portion of the cornea more and a peripheral portion of the cornea less, ablation data for hyperopia correction to ablate the central portion less and the peripheral portion more, ablation data for myopic astigmatism correction to ablate a portion of the cornea closer to a weak principal meridian more and a portion of the cornea farther from the weak principal meridian less, and ablation data for hyperopic astigmatism correction to ablate a portion of the cornea closer to a strong principal meridian less and a portion of the cornea farther from the strong principal meridian more;    selection means for selecting one of myopia correction, hyperopia correction, simple myopic astigmatism correction, compound myopic astigmatism correction, hyperopic astigmatism correction, and mixed astigmatism correction; and    correction means for performing refractive correction based on the selected correction and the calculated ablation data,    wherein upon selection of the simple myopic astigmatism correction or the mixed astigmatism correction, the calculation means calculates both the ablation data for myopic astigmatism correction and the ablation data for hyperopic astigmatism correction based on the input data.    
     
     
         9 . The apparatus according to  claim 8 , wherein upon selection of the simple myopic astigmatism correction or the mixed astigmatism correction, the calculation means calculates the ablation data for myopic astigmatism correction using the following expression:  
           C   Myo   =|S+C |/(1 +X )  and calculates the ablation data for hyperopic astigmatism correction using the following expression:        C   Hyp   =|C|−C   Myo      wherein x is a ratio of change in a spherical component to be effectuated by the ablation data for myopic astigmatism correction, and the input data includes spherical power S and astigmatic or cylindrical power C of the eye.    
     
     
         10 . An apparatus for operation on a cornea of an eye for refractive correction to be achieved by ablating an optical zone of the cornea with a laser beam, the apparatus comprising: 
 input means for inputting data necessary for refractive correction of the eye;    correction means for performing myopia correction to ablate a central portion of the cornea more and a peripheral portion of the cornea less, hyperopia correction to ablate the central portion less and the peripheral portion more, myopic astigmatism correction to ablate a portion of the cornea closer to a weak principal meridian more and a portion of the cornea farther from the weak principal meridian less, and hyperopic astigmatism correction to ablate a portion of the cornea closer to a strong principal meridian less and a portion of the cornea farther from the strong principal meridian more; and    selection means for selecting one of a myopia correction mode, a hyperopia correction mode, a simple myopic astigmatism correction mode, a compound myopic astigmatism correction mode, a hyperopic astigmatism correction mode, and a mixed astigmatism correction mode,    wherein upon selection of the simple myopic astigmatism correction mode or the mixed astigmatism correction mode, the correction means performs both the myopic astigmatism correction and the hyperopic astigmatism correction based on the input data.