Lenstar 900 Biometer

While the introduction of optical biometry revolutionized cataract surgery in the late 1990s, Haag-Streit is writing the latest chapter in biometry history with its Lenstar 900. The Lenstar 900 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 Hill-RBF, Olsen and Barrett formulas and the optional IOL Toric Planner considering the posterior cornea, the Lenstar 900 provides the user with latest technology in IOL prediction for any patient. Dual zone keratometry, with 32 measurement locations or topography measurement with the optional T-Cone, provides reliable and precise measurements for the K values, axis, and astigmatism that are essential to the sophisticated planning of toric lenses. The Lenstar 900 offers the optimal planning platform for superior refractive outcomes in cataract surgery, both now and in the future.

Precise Measuring Data for the Hill-RBF Method

Lenstar 900’s precise measurement technique in combination with the unique Hill-RBF Method allows accurate prediction of the IOL power for every type of eye. To improve refractive outcomes, Lenstar 900 is the optimal choice.

Perfect K Values – Best Toric Results

 The Lenstar 900 features dual zone keratometry or T-Cone topography for precise astigmatism and axis measurement. The integrated Toric Calculator featuring Barrett12, Hill-RBF and Olsen predicts toric IOL power, considering the posterior cornea for best refractive outcomes.

 For Post-Refractive Cases – Quick and Reliable

 Barrett True-K, Shammas No-History and Masket IOL calculation methodologies can be used for postrefractive patients even without any clinical history available.

Complete Optical Biometry

The all-in-one optical biometer and IOL planning platform

 Optical coherence biometry has revolutionized cataract surgery. Featuring OLCR technology, Lenstar 900 is redefining optical coherence biometry. Cutting-edge, multivariable IOL calculation formulae, such as the Olsen, Barrett, Holladay 2 formula or Hill-RBF Method for sophisticated IOL calculation, demand more than just the axial length and keratometry measurement. Lenstar 900 provides all the key biometric parameters simultaneously. In a single measurement scan and using optical low coherence reflectometry (OLCR), Lenstar 900 captures axial dimensions of all of the human eye’s optical structures. Additionally, Lenstar 900 measures corneal curvature, white-to-white and more.

Central Corneal Thickness

As for every other Lenstar 900 axial measurement, optical coherence biometry is used to measure CCT with stunning reproducibility of ±2μm. 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 there is no patient history.

Keratometry / Topography

 Lenstar 900’s unique dual zone keratometry, featuring 32 marker points, provides perfect spherical equivalent7 , magnitude of astigmatism and axis position2,3, making it the biometer of choice for toric IOLs. With the optional T-Cone topography add-on, Lenstar 900 provides full topography maps of the central 6mm optical zone that are crucial for cataract planning.

 White-to-White

 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.

 Pupillometry

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.

Lens Thickness

Accurate measurement of the lens thickness is key to optimal IOL prediction accuracy when using the latest IOL calculation formulae, Olsen or Holladay 2. Measuring the lens thickness with Lenstar 900 significantly improves the IOL prediction accuracy of Holladay 2 and leads to a different IOL power selection in 30% of cases  .

 Anterior Chamber Depth

 Like all axial dimensions captured by the Lenstar 900, ACD is measured by optical coherence biometry, providing more precision and reproducibility 7 . This allows ACD to be measured on phakic as well as on pseudophakic eyes8 . Additionally, the Lenstar 900 is able to display the anatomical anterior chamber depth (endothelium to anterior lens surface).

Axial Length

 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 900 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.

Special Eye Conditions

 All of the described measurements are available for use on the regular eye, as well as for aphakic, pseudoaphakic and silicone oil-filled eyes. In case of error, users may even change the selected eye condition after completion of the measurement procedure.