【Objective】 To investigate a method of calculating intraocular lens (IOL) power that may be independent of prerefractive surgery data in eyes that have previously undergone myopic laser in situ keratomileusis (LASIK). 【Methods】 In 193 eyes of 97 patients

before and 3 months after LASIK

th spherical equivalent(SE)

mean corneal power(Km)and postoperative mean corneal radius(rm) measured by IOLMaster were recorded in the first part of this study.On the basis of above data

A regression model was established between the the actual postoperative corneal power calculated by clinical history method(Kchm) and postoperative mean corneal power(Km)directly measured by the IOLMaster.In the second part of this study

before and 3 months after LASIK

intraocular lens(IOL) calculation with the SE as the target refraction by the IOLMaster was done in another set of 67 post-LASIK patients(132 eyes). The postoperative corneal power corrected by the regression fomula obtained from the first part of this study was used for IOL calculation after LASIK surgery. 【Results】 The regression model(Kchm=1.033×post-Km－2.192) was established and the model R square was 0.916 in the first part of this study. In the second part of this study

IOL calculation with Holladay I or SRK-T formula by using corrected postoperative corneal power was more accurate than that with Haigis

Hoffer-Q or Haigis-L formula within ±1.0D of preoperative equivalent IOL power by comparing above five IOL calculation formulas for three selected IOL types. In addition

it showed that IOL calculation with Haigis formula by entering corrected postoperative corneal power achieved almost the same efficacy compared with Haigis-L formula exclusivly used for IOL calculation after myopic LASIK/PRK/LASEK.【Conclusion】 This study presents a new regression model for correcting postoperative corneal power independent of preoperative data and it will be useful in myopic post-LASIK patients requiring cataract surgery but without pre-LASIK data.