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Dear LENSTAR user, please find below a collection of interesting topics on optical biometry and IOL calculation using the LENSTAR LS 900

Comparison of the measurement of the LENSTAR LS 900 to other optical biometers.

One of the most frequently asked question about the LENSTAR is: "Are the measurements of the LENSTAR comparable to the ones of an IOL Master?"

The answer may be summarised as follows: LENSTAR provides precise measurements, comparable to IOL Master. Furthermore LENSTAR measures lens thickness, corneal thickness and pupil diameter, parameters facilitating the use of latest 4th generation IOL formulae.

Please find all details to this question in the "White Paper" below. It summarizes current peer-reviewed articles on the subject.

White Paper:
Differences in the measurements and their clinical relevance: LENSTAR LS 900 vs. IOL Master

What IOL constant should be used?

An other question often asked about the use of LENSTAR is: "What IOL constant should be used?"

The answer may be summarised as follows: It is always recommended to use personalised IOL constants to achieve best prediction results, still the use of optimised constants for the IOL Master as a basis for initial calculation is the best option available.
IOL constant personalisation is offered by Dr. Warren Hill as a free service exclusive to physicians.

Please find all details to this question in the "White Paper" below. It summarizes current peer-reviewed articles on the subject.

White Paper:
What A-Constant should be used with LENSTAR LS 900?

Tips & Tricks: How to connect to Holladay IOL Consultant

EyeSuite is capable to autopopulate its biometric measurements to Holladay IOL Consultant. Holladay IOL Consultant may be installed on the same PC running the LENSTAR LS 900 optical biometer. LENSTAR is currently the only biometer on the market providing lens thickness, a key parameter to further improve IOL prediction accuracy with Holladay IOL Consultant.

More information on Holladay IOL Cosultant
Tips & Tricks: How to connect to Holladay IOL Consultant

 

Tips & Tricks: How to connect to PhacoOptics

EyeSuite allows the user to connect the biometric measurement data directly to PhacoOptics, the IOL calculation tool featuring Dr. Olsen’s unique model for IOL prediction. One of the key parameters used by PhacoOptics to improve the prediction accuracy is the lens thickness, only measured by LENSTAR LS 900 optical biometer.

More information on PhacoOptics
Tips & Tricks: How to connect to PhacoOptics

 

Tips & Tricks: How to connect to OKULIX

EyeSuite allows the user to connect the biometric measurement data directly to OKULIX, the unique ray tracing based IOL calculation program by Dr. Preussner. OKULIX uses in contrast to standard IOL prediction methods not a formula but ray tracing simulation to predict the IOL power.

More information on OKULIX
Tips & Tricks: How to connect to OKULIX

Video Tutorials (EyeSuite Biometry / EyeSuite IOL)

Instructional Videos

Axial length measurement (AL)

The following video sequence provides you with detailed information on the measurement of the axial length with the LENSTAR LS 900. Axial length is measured laserinterferometcally form the epithelium of the cornea to the inner limiting membrane. Its in vivo repeatability is +/- 35 microns.

Instructional Video:
Axial length measurement (21.6 MB)

Keratometry measurement (K)

The following video sequence provides you with detailed information on the measurement of the corneal curvature with the LENSTAR LS 900. The corneal curvature is measured using 32 reference points on an over all optical zone of 2.3mm. Its in vivo repeatability is +/- 30 microns.

Instructional Video:
Keratometry measurement (9.8 MB)

Central corneal thickness measurement (CCT)

The following video sequence provides you with detailed information on the measurement of the central corneal thickness (CCT) with the LENSTAR LS 900. CCT is measured laserinterferometcally form the epithelium to the endothelium of the cornea. Its in vivo repeatability is +/- 2.3 microns.

 

Instructional Video:
Central corneal thickness measurement (11.1 MB)

Anterior chamber depth measurement (ACD)

The following video sequence provides you with detailed information on the measurement of the anterior chamber depth (ACD) with the LENSTAR LS 900. ACD is measured laserinterferometcally form the epithelium of the cornea to the anterior capsular bag of the lens. Lenstar measures the ACD as a combination of the CCT and the aqueous depth. Its in vivo repeatability is +/- 40 microns.

Instructional Video:
Anterior chamber depth measurement (15.7 MB)

 

Lens thickness measurement (LT)

The following video sequence provides you with detailed information on the measurement of the lens thickness with the LENSTAR LS 900. Lens thickness is measured laserinterferometcally form the anterior capsular bag to the posterior capsular bag of the lens. Lens thickness is the key parameter in latest IOL calculation formulae such as the Holladay II or the Olsen Formula. Its in vivo repeatability is +/- 80 microns.

Instructional Video:
Lens thickness measurement  (19.7 MB)

White to white measuremtn (W2W)

The following video sequence provides you with detailed information on the measurement of the white to white distance with the LENSTAR LS 900. White to white distance is measured on the live video image of the eye taken synchronous to the other measurements. Its in vivo repeatability is +/- 40 microns.

Instructional Video:
White to white measurement (12.6 MB)

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