BESST II IOL POWER CALCULATOR                                    


Developed by Dr Edmondo Borasio and Julian Stevens' Team at Moorfields Eye Hospital, BESSt Formula allows unprecedented levels of accuracy in the calculation of IOL power after Laser Refractive Surgery (LASIK, PRK, LASEK, Epi-LASIK) for Myopia or Hyperopia by using measurements taken with the Oculus Pentacam™ and without any knowledge of pre-refractive surgery information.

BESSt formula only requires the following post laser refractive surgery information: Pentacam’s Anterior and Posterior radii of curvature, Central Corneal Thickness and Axial Length. Now even more accurate with the BESSt 2.0 algorithm. Read more.


Supporting Direct Importing of values between Pentacam and BESSt

  1. Stop wasting time entering the values manually! With the latest Direct Import version, all Pentacam values are directly exported to BESSt with a single click of the mouse. The only requirement is that BESSt II IOL Power Calculator and Pentacam are installed on the same PC. It also works for the Off-line version. Read more.


BESSt formula is now available for the iPhone as part of Eye Pro.

  1. Ever wished having BESSt formula biometry, Standard IOL power formulas, a Visual Acuity converter, a Surgically Induced Astigmatism calculator, a Refraction Plane converter, a Cartesian/Polar converter and a Ray Tracer all in a single and neat Application that you can always carry in your pocket? Well, look no further: Eye Pro has landed on the iPhone! Eye Pro works on the iPhone, iPod Touch, and the latest iPad and it can be downloaded from the App Store. Read more.

IMPORTANT: Before using please read the Spherical Aberration Warning in the Download  Area.

UPGRADE to the latest version:

Users of the Full License can freely upgrade by downloading the new version. No application form is necessary if you already have a Full License working on your PC. 


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BESST 2 formula:


Download BESSt2 IOL Power Calculator NOW!

Evolve today!


BESSt formula lands on the iPhone!

Watch a LIVE demonstration of EYE PRO 2013

From Live WEBINAR of 18th Jan 2014

I have been invited to talk about EYE PRO 2013 at a Webinar in Ecuador on 18th Jan 2014.

I will give a practical demonstration on how to use the most advanced and complex features of the app. Attendance is FREE but availability is limited to the first 100 places.

Ophthalmologists who are interested can register at: