LENSTAR Biometry

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.

Front and side view of the LENSTAR biometer
Lenstar at a glance

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.

Lenstar at a glance

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.

Graphic cross section of the eye

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.

Hill-RBF calculator
Hill-RBF Calculator

Pattern recognition and boundary model for more accuracy and confidence

The Hill-RBF Calculator 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.

Hill-RBF Calculator

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 RBF calculator 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 Hill-RBF Calulator www.RBFCalculator.com

Graph of findings from evaluation of the Hill-RBF calculator

Read below what Dr. Hill and his international team found, when they tested the new Hill-RBF Calculator:

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 Calculator is now available on-line at: www.RBFCalculator.com and is going to be integrated in the Lenstar with the fall release of EyeSuite this year.

Watch as Dr. Snyder reviews the first prospective study a completely new, data driven, self validating, continuously evolving IOL power selection method. 

Snyder video preview
Lens thickness graphic
Lens thickness matters

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.

Lens thickness matters

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.

Clinical study data

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."

Full A-scan of the eye in graph format
Improved refractive outcomes

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.

Improved refractive outcomes

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.

Excellent IOL prediction in all eyes
Graphic of eye

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.

Cutting edge IOL calculation formulae
Dual-zone keratometry
Perfect K's

Perfect K values = best toric results

Lenstar features dual-zone keratometry or T-Cone topography for precise astigmatism and axis measurement. The integrated Barrett Toric Calculator predicts toric IOL, taking into account the posterior cornea for best refractive outcomes.

Perfect K's

Improved outcomes with dual zone keratometry

Lenstar’s unique dual zone keratometry provides measurement of the axis and astigmatism, equivalent to the "Gold Standard" manual keratometry recommended for toric IOL by manufacturers.

The closely spaced 32 measurement point pattern improves precision, both delivering more data and minimizing the need for software data interpolation.

Best toric results with Lenstar’s unique dual-zone keratometry

In a recent study Dr. Kjell Gunnar Gundersen showed how Lenstar improves the patient workflow and refractive outcomes in his toric patients. In the study only Lenstar K readings were used to plane the toric IOL. The results may be summarized as follows:

  • 89% of all eyes had best uncorrected visual acuity within one line of best corrected visual acuity
  • the mean rest cylinder was as low as 0.45D
  • refractive outcomes: 96% <0.5D sphere; 65% <0.5D astigmatism

Please read Dr. Gundersen's conclusion of the study: "We found that 89% of eyes had uncorrected visual acuity within one line of best corrected visual acuity. And this really indicates that we have close to perfect post-operative refractive status!"

Topography for torics
Perfect K's

Topography for torics – match the axis

With the optional T-Cone toric platform, the axis and astigmatism measurement of Lenstar is extended with true 11-ring Placido topography. This additional data improves the efficacy and safety of toric IOL surgery, eliminating the risk of irregularities and allowing the user to double check the axis location.

The T-Cone enables Lenstar to provide true Placido topography of the central 6 mm optical zone. The toric surgery planning platform allows for the planning and optimization of the surgical procedure based on high-resolution and true color eye images taken with Lenstar, either in combination with the T-Cone, or simply based on the dual-zone keratometry of the standard unit. The toric planner shows the implantation axis, the incision location and user-defined guiding meridians in the real patient image. The planning sketch can easily be printed and hung near the microscope for intuitive transfer of the plan to surgery.

T-cone for Lenstar
Advanced IOL Planning

Improved refractive outcomes with any patient

EyeSuite IOL provides a comprehensive set of premium IOL calculation formulae for standard cataract patients as well as for patients with a history of keratorefractive surgery. The optional Toric Planner complements IOL planning with an intuitive tool for toric interventions.

Improved refractive outcomes
Predictable outcomes
Advanced IOL Planning

Predictable outcomes

Modern multivariable formulae such as Barret and Olsen, integrated in EyeSuite IOL, provide predictable outcomes in any patient, independent of anatomic particularities. Using measurements of all compartments of the eye, these formulae allow for the prediction of the IOL positon and subsequently the IOL power with improved accuracy in short, normal and long eyes.

Advanced IOL Planning

Master post refractive cases

EyeSuite IOL provides the user with a set of premium IOL calculation formulae for post-keratorefractive patients with or without known clinical history. Barrett True-K, Shammas No-History, and the Masket formulae have proven their efficacy in several peer-reviewed studies and may be regarded as best-in-class.

Premium IOL calculation formulas
Barrett Toric Calculator
Advanced IOL Planning

Match the axis

The Barrett Toric Calculator provides the user with one of the best toric IOL predictions available on the market. The toric calculator features dynamic calculation of the lens position for cylinder power transformation to the corneal plane as well as consideration of the anterior and the posterior corneal curvature for cylinder power and axis calculation.