Aramberri J (2003). Intraocular lens power calculation after corneal refractive surgery: double-K method. J Cataract Refract Surg. 29:2063-8.

Shammas HJ and Shammas MC (2007). No-history method of intraocular lens power calculation for cataract surgery after myopic laser in situ keratomileusis. J Cataract Refractive Surg. 33:31-36.

Haigis W (2008). Intraocular lens calculation after refractive surgery for myopia: Haigis-L formula. JCRS 34: 1658-1663.

IOL power calculation formulas used:  Double-K Holladay 1, Shammas-PL, & Haigis-L.

With the Double-K Holladay 1 formula, the pre-LASIK/PRK corneal power is used to estimate the effective lens position (ELP) (so-called Double-K approach).  If pre-LASIK/PRK corneal power is not available, 43.86 D is used.

For 52 eyes from Dr. Hill's and Dr. Koch's practices, there was a trend for greater accuracy with the formulas in the middle and right-hand columns.