New Hill-RBF Method
The Hill RBF Method is the first and only IOL prediction methodology that provides the user with best in class IOL power prediction and information on the quality of the calculation, leading to improved refractive outcomes and patient safety. Hill RBF is integral part of the LENSTAR biometer and is available through the ASCRS web page as well as under http://rbfcalculator.com.
Outstanding optic measurement results
While the introduction of optical biometry revolutionized cataract surgery in the late 1990s, Haag-Streit is writing the latest chapter in biometry history with Lenstar.
Lenstar provides highly accurate laser optic measurements for every section of the eye − from the cornea to the retina. With its integrated Olsen formula and the optional Toric Planner featuring the Barrett Toric Calculator, Lenstar supplies the user with latest technology in IOL prediction for any patient.
Biometry of the entire eye in a single measurement
Lenstar simultaneously provides laser interferometric biometry of the entire eye, precise keratometry, astigmatism and axis measurement, WtW and pupillometry simultaneously in a single measurement.
EyeSuite IOL features cutting-edge multivariable IOL formulae for improved refractive outcomes.
Access to full eye data in a single click
Accurate IOL prediction is crucial for patient satisfaction in state of the art cataract surgery. Lenstar provides all measurements needed to take full advantage of the latest generation IOL prediction methods for improved refractive outcomes with one click.
Optical coherence biometry has revolutionized cataract surgery. Featuring OLCR technology, Lenstar is redefining optical coherence biometry.
Cutting-edge, multivariable IOL calculation formulae, such as the Olsen, Barrett or Holladay 2 formula for sophisticated IOL calculation, demand more than just the axial length and keratometry measurement. Lenstar simultaneously provides all the key biometric parameters.
In a single measurement scan using optical low coherence reflectometry (OLCR), Lenstar captures axial dimensions of all of the human eye’s optical structures, from the cornea to the retina. Lenstar also measures corneal curvature, white-to-white and more.
Pattern recognition and boundary model for more accuracy and confidence
The Hill-RBF Method represents a new approach in IOL calculation, based on pattern recognition, data Interpolation and a validating boundary model, for improved accuracy and confidence with IOL power prediction.
Thinking out of the box for a new level of performance
RBF stands for Radial Basis Function, which is like a neural Network, specialised in feature extraction and feature recognition and can handle multiple factors and non-linear relationships. Based on the input parameters axial length (AL), anterior chamber depth (ACD) and corneal curvature (K) it finds the right pattern that lead to an accurate IOL prediction. It is combined with a boundary model, this means that the Hill-RBF Method only provides a result if the respective prediction is accurate with a very high probability. First clinical trials prove that the RBF performs excellent and may even outperform the current most advanced theoretical formulae.
Link to the Hill-RBF Method online calculator www.RBFCalculator.com
Read below what Dr. Hill and his international team found, when they tested the new Hill-RBF Method:
For retrospective testing, looking at 3,212 independent cases from 13 surgeons in eight countries, the outcomes have been impressive with a weighted mean ±0.50 D accuracy of 95%.
“No one’s ever seen numbers like this,” Dr. Hill said.
What is even more impressive than the accuracy is the consistency from one beta test site to the next across Europe, the Middle East, Africa, North and South America, Asia, India, and Australia. This level of consistency reveals that the outcomes are technologically driven.
“In summary, this is a new approach based on pattern-recognition, data interpolation, and a validating boundary model, but just adds an additional level of confidence, and the accuracy of this methodology is due to an increase in flexibility,”
The RBF Method is now available on-line at: www.RBFCalculator.com and is going to be integrated exclusively in the Lenstar with the fall release of EyeSuite this year.
Hit the target any time
Measured lens thickness paired with the integrated Olsen- and Barrett IOL calculation formulae for excellent refractive outcomes with spheric, toric- and multifocal IOL in any eye.
Improved refractive outcomes
Learn more from Dr. Sheridan Lam about how measured lens thickness allows for significant improvement of the IOL prediction accuracy leading to improved outcomes.
In a clinical study published in the Journal of Refractive Surgery, Dr. Sheridan Lam calculated IOL power using the Holladay 2 formula and biometry with Lenstar, including the measurement of the crystalline lens thickness.
The mean absolute and mean refractive error was calculated for IOL power calculation based on measured lens thickness and on age based lens thickness estimation, a method used if no lens thickness measurement is available for IOL power calculation using the Holladay 2 formula.
Even though the measured lens thickness did not significantly differ from the age based estimation, the refractive outcome did improve significantly in the group with measured lens thickness and lead to a different IOL choice in 30% of the cases.
Dr. Lam concludes: "Lens thickness matters and has to be measured. Ignoring the true lens thickness puts the cataract surgeon and the patient at a disadvantage."
Meet patient expectations
Lenstar's full A-scan of the eye and its unique dual zone keratometry provide the foundation for accurate IOL calculation. EyeSuite IOL features the latest generation formulae for improved refractive results in all eyes.
Excellent IOL prediction in all eyes
Latest generation IOL calculation methods such as Olsen and Barrett, implemented in EyeSuite IOL - the IOL planning suite of Lenstar - allow for excellent IOL prediction in short, average and long eyes with standard spherical or toric IOLs. Furthermore, EyeSuite features a comprehensive set of post refractive IOL calculation formulae.
Standard IOL calculation formulae such as SRK/T, Holladay 1 or Hoffer Q - all estimate the effective lens position (ELP) based on axial length and K measurements. This works fine in the average eye but leads to limited prediction accuracy in unusual as well as long or short eyes.
Barrett and Olsen use more parameters, including measured anterior chamber depth and lens thickness to estimate the implant position of the IOL in the eye. The additionally implemented ray tracing in their calculation methods result in formulae that allow for excellent IOL prediction in all kind of eyes; short-, long- and even unusual ones.
Today, IOL calculation in post-keratorefractive patients still is one of the most demanding tasks in cataract surgery. To support the surgeon in this challenging job, EyeSuite IOL features a comprehensive set of cutting-edge IOL calculation formulae for post refractive patients with or without clinical history available.