T2 Calculator

A spreadsheet version of the T2 Formula Calculator for Microsoft Excel and OpenOffice Calc.

Provides single and multiple IOL calculations.

Integrated K Calculator

Integrating the corneal measurements from several instruments improves astigmatic outcomes for toric IOL implantation.

This Integrated K Calculator calculates the median and mean keratometry from up to 5 instruments.


These tools are provided to assist physicians in selecting the appropriate IOL for a particular patient.

They are intended to be used in conjunction with a comprehensive ophthalmic examination and the appropriate diagnostic tests and measurements necessary for cataract surgery candidates.

The results obtained by the tools are not intended to serve as medical or surgical instruction from the authors, or be definitive; nor can the authors guarantee that the results will be accurate in every case.

Physicians who use the tools must arrive at their own independent determinations regarding the proper treatment for their patients and are solely responsible for the refractive outcome.

By using these tools, you agree to waive and hold the formula authors harmless from any claims you may have arising out of your use of them.