Eye Pro:


(Borasio Myopic/Hyperopic Regression)


Borasio Myopic/Hyperopic Regression (BMR, BHR) is Dr Edmondo Borasio’s latest and most accurate formula for post laser refractive surgery (LRS) biometry, according to the last analysis performed on his dataset of 136 eyes (unpublished data, presented at the 9th IOL Power Club Meeting in Haarlem, on 12.10.2013).

Click on the image below to see the presentation given at the 9th IOL POWER CLUB MEETING, showing the greater accuracy of BMR/BHR and BESSt 2 biometry formulas compared to other methods, in eyes undergoing cataract surgery with no pre-refractive surgery data.

Dr Borasio is Member of the prestigious IOL POWER CLUB, a private international non-profit organization dedicated to advancing the science of optimized intraocular lens power selection algorithms and technology.

How does the formula work?

  1. BMR/BHR only requires IOLMaster®'s K values and axial length (see presentation above).

  1. From the IOLMaster®'s K values, a new corneal power (CP) is obtained according to two regression formulas based on his personal dataset. The resulting CP value is then automatically entered in the SRK/T formula, yielding a suggested IOL power. No double K adjustment should be used.

  1. Three slightly different types of regression were developed (Linear, Logarithmic and Polynomial) and they give similar results in most cases.

  1. According to the latest analysis THE MOST ACCURATE ALGORITHMS to be used are the following ones:

  2. BMR Poly for post MYOPIC LRS eyes.

  3. BHR Lin for post HYPEROPIC LRS eyes.

  1. It is recommended ADDING 0.50 D to the IOL power suggested by BHR Lin and ADDING 0.25 D to the IOL power suggested by BMR Poly to reduce the risk of a Hyperopic outcome.

BMR/BHR should NOT be used in virgin corneas or in eyes after radial keratotomy or other types of refractive surgery different from LASIK or Surface Ablation.

BMR/BHR and BESSt only reduce but does not eliminate the risk of a refractive surprise. You must therefore always compare the results with those from different published formulas and to those of the ASCRS Website. When in doubt, refer the case to a colleague who is specialised in post-LASIK biometry.

The formulas have to be considered EXPERIMENTAL IN NATURE and YOU WILL HAVE TO AGREE TO USE THEM AT YOUR OWN RISK. The program is not a substitute for an Ophthalmologist's professional judgment and under no circumstances EB EYE Limited, Dr Edmondo Borasio, or any related company or people, including the inventors of other formulas, shall bear ANY responsibility whatsoever for any harm or damage (economical or of any other nature) this choice might cause. This also includes, but is not limited to, loss of business arising from the use or the inability to use the program. The calculators provided are not meant to be a substitute for professional advice and are not to be used for medical diagnosis and treatment. Extensive effort has been exerted to make this software as accurate as possible. However, the accuracy and completeness of the information provided by this software cannot be guaranteed. This software is to be used as a guide only, and health care professionals should use sound clinical judgement and individualize therapy to each specific patient care situation. All calculations must be confirmed before clinical use or diagnostic purposes by qualified medical professionals. The authors make no claims whatsoever, expressed or implied, about  the authenticity, accuracy, reliability, completeness or timeliness of the material, software, text, graphics and links given. IN NO EVENT SHALL THE AUTHORS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE AUTHORS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. THE AUTHORS SPECIFICALLY DISCLAIM ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS ON AN AS IS  BASIS, AND THE AUTHORS HAVE NO OBLIGATIONS TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. This software program is neither FDA nor CE approved.

Back to Functions Menu.


Click on the icon to visit the Application page on iTunes.

© EB EYE 2019 | Disclaimer | Privacy Policy