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, Lenstar provides the user with latest technology in IOL prediction for any patient.

Biometry eye measurements
All at once

Access to full eye data in a single click

In a single measurement scan using optical low coherence reflectometry (OLCR), Lenstar captures axial dimensions of all of the human eye’s optical structures. Lenstar also 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.

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 Lenstar.

Lenstar offers all biometry measurements of the eye
CCT measurement

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 Lenstar, ACD is measured by optical coherence biometry, providing better precision and reproducibility. This allows ACD to be measured on phakic as well as on pseudophakic eyes.

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

Anterior chamber depth
Lens thickness

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 Dense Cataract Measurement (DCM) mode provides cutting-edge performance with respect to penetration rates.

Axial length

Lenstar’s unique dual zone keratometry, featuring 32 marker points, provides excellent spherical equivalent, the magnitude of astigmatism and the axis position, making it the biometer of choice for toric IOLs.

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.

White to white

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.

Precise axis measurement
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.

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!"

Lenstar’s unique T-cone topography
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.

Image of topography on screen
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.

Lenstar includes premium calculation formulae
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.

Master post refractive cases
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.


Thirty-two points of difference

LENSTAR® provides you with a complete biometrical assessment of the patient’s eye—seven measurements—in a single procedure, including:

  • Paychymetry
  • Lens Thickness
  • Keratometry
  • Pupillometry
  • Axial Length
  • ACD
  • White to White

Get an in-depth looks at these measurements.

Seven biometry measurements

Central Corneal Thickness

Central Corneal Thickness (CCT) is measured using optical coherence technology, leading to unmatched accuracy and precision. Reproducibility of this measurement is as good as ± 2 microns, providing one of the base parameters for possible laser correction of the cataract surgery. Measuring CCT along with the other measurements takes less than 30 seconds, which will help increase patient flow.


Anterior Chamber Depth

Just like other length measurements, ACD is assessed with optical coherence technology (OLCR). Combined with the CCT measurement, LENSTAR® provides you with the anatomical (= Aqueous Depth = AD) as well as ACD, as measured by ultrasound biometers. LENSTAR offers repeatable precision compared to slit lamp technology.


Lens Thickness (LT)

Modern multivariable IOL calculation formulae use the patient's lens thickness as an input parameter. LENSTAR® provides the measurement of true lens thickness on the visual optical line of the patient using optical coherence technology (OLCR). No estimation or additional ultrasound measurement is required to get this important parameter. Lens thickness is one of the most important measurements of the Lenstar system.


Axial Length (AL)

Optical coherence technology using a superluminescent diode as light source allows the measurement of the axial length of the patient’s eye on the visual optical line in highest precision and through dense cataracts. Axial Length is a major component in two important formulas used in the LENSTAR measurements.



A 32 marker pattern ensures precise assessment of the corneal curvature. The distribution of the marker on two concentric circles allows stable measurements even with non-compliant patients. The Keratometry measurement exemplifies the superiority of the LENSTAR system by providing expanded Keratometry information. LENSTAR uses 32 measurement points placed on two concentric rings of 16 points each at 1.65mm and 2.3mm.



For sulcus fixated IOLs and for the calculation of the IOL power using the Holladay II formula, LENSTAR® measures white to white distance (horizontal Iris width). The White to White measurement is gathered automatically form optical biometry. White to White is integral when implanting sulcus fixated ICLs. LENSTAR reduces "chair-time" by obtaining the white to white measurement instantly with the other measurements.



The software allows for measurement of the patient’s pupil diameter in ambient light condition. By measuring it instantly, LENSTAR saves you time. Pupillometry is an important addition to your data.


Retinal Thickness (RT)

An easy-to-use manual selection of the retinal peaks in the A-scan enables the user to measure RT (distance between the ILM and the RPE) and to calculate IOL based on the individual RT. A typical value for the RT is automatically displayed and employed for IOL calculation. LENSTAR delivers results comparable to existing ultrasound and optical biometers.

Retinal thickness image
Special eye conditions

Special Eye Conditions

All of the measurements described here are available for measuring the “normal” cataract patient as well as for aphakic, pseudoaphakic and silicone oil filled eye conditions. In case of an error, you may even change the selected eye condition after completion of the procedure. The eccentricity of the visual optical line is assessed with respect to white-to-white as well as to the pupil center. Both are important parameters for laser refractive procedures.