Precise measuring data for the Hill-RBF Method
Lenstar’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 is the optimal choice.
For post-refractive cases –
quick and reliable
Barrett True-K, Shammas No-History and Masket IOL calculation methodologies can be used for post-re-fractive patients even without any clinical history available.
Perfect K values –
best toric results
The Lenstar features dual zone keratometry or T-Cone topography for precise astigmatism and axis measurement2,3. The integrated Barret Toric Calcula-tor predicts toric IOL, considering the posterior cor-nea for best refractive outcomes.
Topography for torics – match the axis
With the optional T-Cone toric platform, the axis and astigmatism mea-surement 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 on the topography maps as well as in the surgical plan-ning sketch on high resolution images of the patient’s eye. The T-Cone is combined with the EyeSuite IOL Toric Planner for optimal planning of the intervention based on the Barrett Toric Calculator.
Precise measurements and intuitive
planning – best toric results
Lenstar’s unique dual zone keratometry provides measurement of the axisand 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.
Optionally, the Lenstar can be equipped with the T-Cone topography add-on. That feature not only enables axis and astigmatism measurement but also offers full topography maps of the central 6 mm optical zone. In addition to topography, EyeSuite IOL also now features a toric IOL planning platform that is included with the T-Cone.
Fast, precise and comprehensive for
better refractive results
The measurement process of the Lenstar is fast and optimized to ensure maximum patient comfort – users report five scans of both eyes in three minutes or less, optional the Automated Positioning System (APS) features dynamic eye-tracking allowing easy automated measurement acquisition with a single click. The Dens Cataract Measurement (DCM) Mode ensures state-of-the-art cataract penetration. Each of the measurements can be validated for efficacy and adjusted, if necessary, to ensure complete bi-ometry accuracy.
In addition to the Olsen, Barrett and standard IOL calculation formulae Eye-Suite IOL provides the user with a set of premium IOL calculation formulae for post-keratorefractive patients. Barrett True-K, Shammas No-History, and Masket formulae have proven their efficacy in several peer-reviewed studies and may be regarded as best-in-class.
Central corneal thickness CCT
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 there is no patient history.
Keratometry K / TopographyTopo
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.
Lens thickness LT
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 significantly improves the IOL prediction accuracy of Holladay 2 and leads to a different IOL power selection in 30% of cases.
Anterior chamber depth ACD
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).
Axial length AL
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.
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.