Objective To investigate the refractive outcomes of intraocular lens （IOL） power calculations after refractive surgery with equivalent keratometry readings （EKR） and the double-K adjustment of the Holladay I formula. Methods In this retrospective study， 45 eyes of 32 patients undergoing phacoemulsification and IOL implantation after myopic laser in situ keratomileusis or photorefractive keratectomy were enrolled. Corneal power was obtained with a Pentacam and IOL Master. The IOL power was calculated by three methods： EKR， a clinical history and the Haigis-L formula. Final postoperative refraction was measured 1 month after the surgery. The median absolute error （MedAE） and the mean absolute error （MAE） of postoperative refraction were compared with those from the Haigis-L formula and the clinical history. The Kruskal-Wallis test was used to compare MedAE and one-way ANOVA was used for MAE. The accuracy of the EKR method was compared with other popular IOL calculation formulas for use in eyes after LASIK or PRK. Results EKR achieved the greatest predictive accuracy （P<0.05）， with a MedAE of 0.32 D and MAE of 0.39 D. Seventy-one percent of eyes were within ±0.50 D and 93% were within ±1.00 D of the EKR predicted outcome. This was significantly more accurate than the other preoperative methods： MedAE was 0.51 D and was 1.48 D for the Haigis-L method and the clinical history， respectively. Conclusion The IOL power estimation in challenging eyes with prior LASIK or PRK is most accurately predicted by EKR.
Solomon KD， Fernandez de Castro LE， Sandoval HP， et al.LASIK world literature review： quality of life and patient satisfaction[J]. Ophthalmology，2009，116（4）：691-701.
[2]
Latkany RA， Chokshi AR， Speaker MG， et al. Intraocular lens calculations after refractive surgery[J]. J Cataract Refract Surg，2005，31（3）：562-570.
[3]
Karunaratne N. Comparison of the Pentacam equivalent keratometry reading and IOLMaster keratometry measurement in intraocular lens power calculations[J]. Clin Experiment Ophthalmol，2013， 41（9）：825-834.
[4]
Awwad ST， Kilby A， Bowman RW， et al. The Accuracy of the double-K adjustment for third-generation intraocular lens calculation formulas in previous keratorefractive surgery eyes[J]. Eye Contact Lens，2013，39（3）：220-227.
[5]
Hoffer KJ. Intraocular lens power calculations after previous laser refractive surgery[J]. J Cataract Refract Surg，2009，35（4）：759-765.
Tang M， Wang L， Koch DD， et al. Intraocular lens power calculation after previous myopic laser vision correction based on corneal power measured by Fourier-domain optical coherence tomography[J]. J Cataract Refract Surg，2012，38（4）：589-594.
[8]
McCarthy M， Gavanski GM， Paton KE， et al. Intraocular lenspower calculation after myopic laser refractive surgery： a comparision of methods in 173 eyes[J]. Ophthalmology，2011，118（5）：940-944.
[9]
Geggel HS. Pachymetric ratio no-history method for intraocular lens power adjustment after excimer laser refractive surgery[J]. Ophthalmology，2009，116（6）：1057-1066.
[10]
Wang L， Booth MA， Koch DD. Comparison of intraocular lens power calculation methods in eyes that have undergone LASIK[J]. Ophthalmology，2004，111（10）：1825-1831.
[11]
Klein BE， Klein R， Lee KE， et al. Incidence of age-related cataract over a 15-year interval the Beaver Dam Eye Study[J]. Ophthalmology，2008，115（3）：477-482.
[12]
Saiki M， Negishi K， Kato N，et al. A new central-peripheral corneal curvature method for intraocular lens power calculation after excimer laser refractive surgery[J]. Acta Ophthalmol，2013， 91（2）：133-139.
[13]
Shammas HJ， Shammas MC， Hill WE. Intraocular lens power calculation in eyes with previous hyperopic laser in situ keratomileusis[J]. J Cataract Refract Surg，2013，39（5）：739-744.
[14]
Huang D， Tang M， Wang L， et al. Optical coherence tomography-based corneal power measurement and intraocular lens power calculation following laser vision correction[J]. Trans Am Ophthalmol Soc，2013，111：34-45.
Falavarjani KG， Hashemi M， Joshaghani M， et al. Determining corneal power using Pentacam after myopic photorefractive keratectomy[J]. Clin Experiment Ophthalmol，2010，38（4）：341-345.
[17]
Lam S， Gupta BK， Hahn JM， et al. Refractive outcomes after cataract surgery： Scheimpflug keratometry versus standard automated keratometry in virgin corneas[J]. J Cataract Refract Surg，2011，37（11）：1984-1987.
[18]
Shammas HJ， Hoffer KJ， Shammas MC. Scheimpflug photography keratometry readings for routine intraocular lens power calculation[J]. J Cataract Refract Surg，2009，35（2）：330-334.
[19]
Savini G， Barboni P， Profazio V， et al. Corneal power measurements with the Pentacam Scheimpflug camera after myopic excimer laser surgery[J]. J Cataract Refract Surg，2008， 34（5）：809-813.
[20]
Tang Q， Hoffer KJ， Olson MD， et al. Accuracy of Scheimpflug Holladay equivalent keratometry readings after corneal refractive surgery[J]. J Cataract Refract Surg，2009，35（7）：1198-1203.
Savini G， Bedei A， Barboni P， et al. Intraocular lens power calculation by ray-tracing after myopic excimer laser surgery [J]. Am J Ophthalmol，2014，157（1）：150-153.
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