The Hill-RBF Calculator is an advanced, self-validating method for IOL power selection employing pattern recognition and sophisticated data interpolation. It has been optimized for use with the Haag-Streit LENSTAR, using optical biometry for all axial measurements and high density autokeratometry.
Radial basis function IOL power selection performs the same for short, normal and long eyes. Based in artificial intelligence, this methodology is entirely data driven and free of calculation bias.
The fundamental advantage of pattern recognition for selecting an IOL power is achieved through the process of adaptive learning - the ability to learn tasks based solely on data, independent of what is previously known. Current methods limit possibilities to situations that are already understood. This method is also self-organizing, meaning that it has the ability to create its own organization, or representation of data. Such an approach is well-suited to the complex, non-linear relationships that make up many aspects of the human eye.
Unlike static theoretical formulas, this approach will be an ongoing project and continuously updated as "big data" exercise. The greater the number of surgical outcomes that are fit to the RBF model, the greater the overall depth of accuracy. Beginning in January of 2018, the size of the RBF calculator database was increased by almost four times. In it's preset form, version 2.0 of the Hill-RBF Calculator has been optimized for from +30.00 D to +6.00 D for biconvex IOLs and from +5.00 D to -5.00 D for meniscus design IOLs.
Version 2.0 of the Hill-RBF method will be released as part of the Haag-Streit LENSTAR EyeSuite biometry software on January 25, 2018.
Hill-RBF Calculator Version 2.0 includes the following updates:
- It is now possible to enter your target spherical equivalent in a manner similar to other popular vergence and ray tracing formulas.
- The database for normal eyes has been expanded by 8,974 cases. An out-of-bounds indication for this patient population will be less common.
- With the addition of more than 1,000 cases with a very short axial length, the range of in-bounds calculations for the high axial hyperope has been significantly increased.
- The range of in-bounds calculations for the high to extreme axial myope has also been greatly increased based on a large database of usual low power IOLs. In-bounds calculations for the high to extreme axial myope will now include meniscus design IOLs from +5.00 D to -5.00 D.
- Because the database for Version 2.0 of the RBF calculator has been increased from 3,445 to 12,419 eyes, the IOL power recommended the same pre-operative measurements may be slightly different. This is the result of the artificial intelligence model being re-fit to a new database and is what we would expect to see.