Lenstar 900 - High precision keratometry & topography

Biometry

High precision keratometry & topography

Optimal IOL selection & refractive outcomes

Keratometry

Lenstar 900’s unique dual zone keratometry provides axis and astigmatism measurements equivalent to the “gold-standard" manual keratometry. The closely spaced 32 measurement point pattern improves precision, both delivering more data and minimizing the need for software data interpolation.

Cornea map

Simultaneously with the keratometry measurement, the Lenstar 900 generates an axial curvature map of the central 3 mm zone of the anterior cornea using 48 measurement points. The cornea map* indicates the astigmatism's regularity and symmetry and therefore provides decision support in choosing the appropriate IOL type for toric candidates.

*Cornea map: Availability of these new features may vary by region. Please contact your local Haag-Streit Distributor for details.

T-Cone Topography

For even greater confidence in toric procedures, the optional T-Cone toric platform offers a mountable true 11-ring Placido topographer, delivering detailed axial, tangential, and elevation maps of the central 6 mm optical zone. Integrated with the EyeSuite IOL toric planner, the T-Cone toric platform ensures optimal intervention planning, improving surgical outcomes and accuracy.

View fullscreen

Keratometry overview

Detailed data review & quality management

The keratometry overview screen provides a concise and comprehensive overview of all relevant data. This enables an efficient review of the image quality of the keratometry measurement points related to the patient's tear film stability. Using this information allows a user to make an informed decision about which specific datapoints to include and which ones to exclude from the final examination calculation.

View fullscreen

Cornea map overview

Decision support for toric candidates

The Cornea map overview shows the axial curvature map of the anterior central cornea that is calculated based on 48 measurement points (right). The cornea map indicates whether an astigmatism is regular and symmetrical. The quality control (left) displays infrared images of the reflected keratometry points on the cornea (Four images per K-reading).

View fullscreen

Topography overview

Topography data review and quality management

The topography overview screen provides a concise and comprehensive overview of captured topography information and includes axial and tangential curvature as well as elevation maps and images of Placido ring reflections for each individual measurement taken. This allows an efficient review of data and image quality and supports detection of artefacts such as a torn tear film break up or obstructing eye lashes. In addition, users can easily include or exclude individual measurements to obtain optimum topography results.

View fullscreen

Axial curvature map

Assessment of regularity of the astigmatism

The axial curvature map, sometimes also referred to as the sagittal map or power map, is the most commonly used topography representation. It allows to gain a good overall perspective on the regularity of the astigmatism and thus enables rapid decision making about a patient’s suitability for a toric IOL.

View fullscreen

Tangential curvature map

Identification of local irregularities

The tangential curvature map, sometimes also referred to as the local curvature map or instantaneous rate of curvature, enables detection of more subtle, localized corneal curvature irregularities. This is especially useful for early detection of corneal pathology such as Keratoconus.

View fullscreen

Elevation map

Detection of local elevations or depressions

The elevation map provides insights into how much the cornea deviates from a best-fit sphere of the cornea. This allows identification of small elevations or depressions that may be caused by pathologies or have been induced during surgery. This maps has proven to be an excellent tool for post-refractive documentation of surgery.