Post-LASIK IOL Calculator

Patient Information

Patient Name
Which Eye?


Axial Length
Anterior Chamber Depth
Vertex Distance
Target Refraction
IOL A-Constant



If you would like to participate in our post-operative outcomes study, please enter your email address below. The data you enter will be stored in a HIPAA-compliant fashion (if you do not enter an email address, your data will not be stored). I will follow-up via email n a few months to obtain post-surgical data, so that we may compare the various methods against each other.
Email Address:

Pre-LASIK Data
  Sphere Cylinder Axis
Manifest Refraction
  K1 K2  
Check here if Pre-Op K's are not known.


Post-LASIK Data
  Sphere Cylinder Axis
Manifest Refraction 
  K1 K2  


Recent Data
  Sphere Cylinder Axis
Manifest Refraction
  K1 K2  


Fill in all fields, verify your data, then click on the submit button below. By clicking below, you acknowledge that the authors of this software are not responsible for any errors or omissions. Furthermore, you acknowledge that you will independently verify all calculations prior to using any results to determine intraocular lens selections for patients, and release the authors from any liability.



This calculator uses both the Haigis and SRK-T formula with a variety of "fudge factors" that have been described in the literature over the past few years. These "fudge factors" are necessary because the post-refractive surgery cornea does not have the same relationship between anterior and posterior corneal surface that a normal cornea does. The following methods are employed:

• Historical Method Refract Corneal Surg. 1989;5:203
• Feiz-Mannis Method Cornea 2001; Vol 20, No 8, 792-797
• Koch Method JCRS 2003; 29: 2039-2042
• Masket Method JCRS 2006; 32: 430-434
• Walter Method JCRS 2006; 32: 425-9
• Shammas No-History Method AJO 2003; Vol 136, No 3, 426-432
• Latkany Flat-K Method  JCRS 2005; 31: 561-570
• Latkany Average-K Method JCRS 2005; 31: 561-570
• Mannis Nomogram Ophthalmology 2005; 112: 1381-7
• Aramberri Double-K Method JCRS 2003; 29: 2063-68

Disclaimer: This calculator is offered as a service to the Ophthalmologic community for EDUCATIONAL and RESEARCH purposes only. This calculator is not related in any way to any of the authors listed above and has not been reviewed by them for accuracy. The names for the various methods are just to keep them straight in my head -- other people may refer to them by other names, so if you want to know what they are, please see the journals listed above. The IOL formulas "SRK-T" and "Haigis" were implemented using the published formula and have not been reviewed nor endorsed by Drs. "S", "R", "K", or Haigis.

Special thanks to Parag A. Majmudar, M.D. and Dianna Seldomridge, M.D. for their contributions to this calculator.


All pages are Copyright ©2006 by Dennis H. Goldsberry, M.D., P.E.
Reproduction or archival of any protion of these pages is strictly prohibited except by express written permission