LENSTAR LS 900

An excellent choice for all IOL types in any anatomy

LENSTAR provides highly accurate laser optic measurements for every section of the eye − from the cornea to the retina − and is the first optical biometer on the market that can measure the thickness of the crystalline lens. With its integrated Olsen formula and the optional Toric Planner featuring the Barrett Toric Calculator, the LENSTAR provides the user with latest technology in IOL prediction for any patient.

All at once

Access to full eye data, in a single click

In a single measurement scan and using optical low coherence reflectometry (OLCR), LENSTAR captures axial dimensions of all of the human eye’s optical structures. Additionally, LENSTAR measures corneal curvature, white-to-white and more.

All at once

Complete optical biometry for better outcomes

Precise measurement of the entire eye − from cornea to retina − is key to achieving optimal IOL prediction accuracy in surgery.

The LENSTAR is the first optical biometer to provide the surgeon with all the measurements necessary to take full advantage of the latest IOL prediction methods, such as the Barrett and Olsen formulae, now integral to the LENSTAR.

As for every other LENSTAR axial measurement, optical coherence biometry is used to measure CCT with stunning reproducibility of ±2 μm. CCT is a key parameter in glaucoma diagnosis, and is also used for laser refractive surgery and/or to differentiate prior myopic or hyperopic LASIK procedures when the patient history is not available.

Like all axial dimensions captured by the LENSTAR, ACD is measured by optical coherence biometry, providing more precision and reproducibility. This allows ACD to be measured on phakic as well as on pseudophakic eyes.

Additionally, the LENSTAR is able to display the anatomical anterior chamber depth (endothelium to anterior lens surface).

Accurate measurement of the lens thickness is key to optimal IOL prediction accuracy when using the latest IOL calculation formulae, like Barrett, Olsen or Holladay 2.

Dr. Sheridan Lam reported in 2012 that measuring the lens thickness with LENSTAR significantly improves the IOL prediction accuracy of Holladay 2 and leads to a different IOL power selection in 30% of cases.

OLCR technology, using a superluminescent diode as the laser source, enables measurement of the axial length of the patient’s eye, precisely on the patient’s visual axis and in the presence of dense media.

The user can review and move all of the measuring gate positions on the A-scan if necessary.

The LENSTAR A-scan appears very similar to an immersion ultrasound scan, for easy user interpretation. The advanced digital signal processing used with the Dens Cataract Measurement (DCM) mode provides cutting-edge performance with respect to penetration rates.

LENSTAR's unique dual zone keratometry, featuring 32 marker points, provides perfect spherical equivalent, magnitude of astigmatism and axis position, making it the biometer of choice for toric IOL's.

With the optional T-Cone topography add-on, LENSTAR provides full topography maps of the central 6 mm optical zone that are crucial for cataract planning.

Based on high-resolution color photography of the eye, every white-to-white measurement can be reviewed and adjusted by the user if necessary. As such, it is fully reliable for use with anterior chamber and sulcus-fixated phakic IOLs. It can also be used to determine advanced IOL calculation formulae.

Measurement of the pupil diameter in ambient light conditions can be used as an indicator for the patient’s suitability for apodized premium IOLs, as well as for laser refractive procedures.

All at once

Efficiency & precision

With APS, taking biometry measurements has never been easier. Biometry at a single click on the joystick saves time and increases patient and user comfort.

All at once

Reliable & easy to delegate – more efficient

LENSTAR APS improves the repeatability of measurements assisting the user with the fine alignment of the device and allows easy to delegate biometry for efficient patient flow in your practice.

The Automated Positioning System of the LENSTAR APS assists the user during the measurement process with dynamic eye tracking. This feature is combined with LENSTAR’s superior measurement technology providing axial measurements of the entire eye, dual zone autokeratometry and optional topography for best IOL prediction in all eyes.

Hill-RBF method

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 method

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.

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.

Perfect K's

Perfect K values – best toric results

The LENSTAR features dual zone keratometry or T-Cone topography for precise astigmatism and axis measurement. The integrated Barret Toric Calculator predicts toric IOL, considering 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.

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
  • 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 postoperative refractive status!"

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 the LENSTAR to provide true Placido topography of the central 6 mm optical zone. The toric surgery planning platform allows planning and optimization of the surgical procedure based on high-resolution and true color eye images taken with the 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.

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 kreatorefractive surgery. The optional Toric Planner complements IOL planning with an intuitive tool for toric interventions.

Advanced IOL Planning

Predictable outcomes

Modern multivariable formulae like 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 allows these formula to predict 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.

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.

Lectures