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

Shammas HJ, Shammas MC, Hill WE (2013). Intraocular lens power calculation in eyes with previous hyperopic laser in situ keratomileusis. J Cataract Refract Surg. 39:739-44.

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.