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Purpose . To validate clinically a new method for estimating the corneal power ( P    c  ) using a variable keratometric index ( n    k adj ) in eyes with previous laser refractive surgery.  Setting . University of Alicante and Medimar International Hospital (Oftalmar), Alicante, (Spain).  Design . Retrospective case series.  Methods . This retrospective study comprised 62 eyes of 62 patients that had undergone myopic LASIK surgery. An algorithm for the calculation of  n    k adj  was used for the estimation of the adjusted keratometric corneal power ( P    k adj ). This value was compared with the classical keratometric corneal power ( P    k  ), the True Net Power (TNP), and the Gaussian corneal power ( P    c Gauss ). Likewise,  P    k adj  was compared with other previously described methods.  Results . Differences between  P    c Gauss  and  P    c   values obtained with all methods evaluated were statistically significant ( p  < 0.01). Differences between  P    k adj  and  P    c Gauss  were in the limit of clinical significance ( p  < 0.01, loA [−0.33,0.60] D). Differences between  P    k adj  and TNP were not statistically and clinically significant ( p  = 0.319, loA [−0.50,0.44] D). Differences between  P    k adj  and previously described methods were statistically significant ( p  < 0.01), except with  P    c HaigisL  ( p  = 0.09, loA [−0.37,0.29] D).  Conclusion . The use of the adjusted keratometric index ( n    k adj ) is a valid method to estimate the central corneal power in corneas with previous myopic laser refractive surgery, providing results comparable to  P    c HaigisL .

Clinical Validation of Adjusted Corneal Power in Patients with Previous Myopic Lasik Surgery