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Post-LASIK cataract surgery IOL calculation

Wang Vision 3D Cataract and LASIK Center, Nashville, Tennessee

Wang Vision 3D Cataract & LASIK Center is an international referral center, for corneal topography interpretation and for intraocular lens power calculation for cataract surgery, particularly in a post-RK/LASIK/PRK eyes, since in these eyes, the IOL power is much likely to be off, hence, special skills and knowledge are needed to perform the appropriate IOL power calculation. We are actively conducting research projects in these areas and offer a free IOL calculation service for cataract surgeon colleagues from around the U.S. and the world. We have published the following major textbooks, in this field:

And peer-reviewed articles:

If you have difficult IOL calculation for cataract surgery for your patients, particularly for post-RK/LASIK/PRK eyes, you are welcomed to contact us at, we will do our best to help you and your patients. Our calculation for you and your patients are free-of-charge, and we do collect these data, for our on-going research effort, to improve the state-of-the-art technology in IOL calculation for post-RK/LASIK/PRK eyes.

The following data is required for the clinical history method:

K's Pre-Op    
MR Pre-Op    
MR Post-Op    
K's Post-Op    

Refraction derived Keratometry readings at the spectacle plane, and corneal plane can be calculated using the clinical history method.

Gas perm lenses can be used to determine the corneal curvature. Known contact lens power and base curve, when combined with the over-refraction in the corneal plane, allow calculation of the corneal curvature.

Adjusted Effective Refractive Power (Eff RPadj): Measurement of post-op corneal power using the EyeSys corneal analysis system provides the Eff RPadj in the Holladay diagnostic summary. [Eff RPadj = Eff RP - (0.15 x ΔMR). (Mean SE +0.88+/-)]

Maloney Method: Central corneal power is determined using the Humphrey Atlas topographer, with modification of the formula: CP = (central topographic power) x [376/337.5]) - 4.9.

Orbscan IIz: Two measurements using the Orbscan IIz, 2 mm total mean power calculation and a 4 mm total optical power calculation.

If you have difficult IOL calculation for cataract surgery for your patients, please email us or call (615)321-8881.


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Dr. Wang, Eye Surgeon, provides laser vision correction, 3D LASIK, laser cataract and many advanced laser eye surgeries to patients in the Nashville, TN area
and all over the US and world. Dr. Wang's celebrity LASIK patients:  Dolly Parton, Charlie Daniels, Kenny Chesney, 3 Doors Down, Naomi Judd, and more...

This site is for informational purposes only. It is not intended to be medical advice. If you would like professional medical advice about any laser eye surgery procedure, please
schedule an appointment or attend our next Free LASIK and Cataract Seminar in Nashville, Tennessee.

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