Haag-Streit Lenstar 900 uses optical low coherence reflectometry (OLCR) for measurement of the axial length parameters of the eye. This is the basis for excellent IOL prediction. It was the first optical biometer to capture all relevant axial dimensions of the eye to take full advantage of latest generation IOL prediction methods. Additionally, the Lenstar 900 measures a wide range of useful biometric parameters, including pupillometry, corneal curvature, white-to-white, and more.

The Lenstar 900’s dual-zone keratometry ensures highly precise measurements of the K readings, axis orientation, and astigmatism. With the optional T-Cone add-on, the Lenstar 900 expands further to provide true 11-ring Placido topography of the central 6mm optical zone. These features facilitate the detection of irregular astigmatism and offer precise verification of axis alignment, ensuring optimal IOL selection and refractive outcomes.

Scientific credibility is built over time, and the Lenstar 900 stands as a testament to precision and reliability in biometry. Validated in numerous studies and cited in 3,550* scientific articles by the end of 2025 – including 316* in 2025 alone – it remains a cornerstone for researchers and clinicians worldwide. With thousands of devices sold, millions of patients have benefited from excellent refractive outcomes.

*Source: Google Scholar search (January 5, 2026) – keywords: Lenstar “Haag Streit”, excluding citations and patents.

Fast measurement times and effective delegation are key to running an efficient cataract clinic. The Lenstar 900’s biometry, keratometry, pupillometry, and white-to-white measurements, are all acquired during one single data acquisition process. Thanks to its intuitive user-interface and its Automated Positioning System APS, the Lenstar 900 is a productive and cost-effective biometer.

With myopia becoming a global pandemic, Haag-Streit has introduced Lenstar Myopia, utilizing the core technology and accuracy of a Lenstar 900 biometer to address the challenge. The tailored myopia control software—with tools for detection and follow up of myopia and parent education reports—is available to any Lenstar 900 and Eyestar 900 user with a straight-forward software update.

Learn more about getting the most out of your biomter with the Haag-Streit Academy 'Improving Outcomes' Basic and Advanced Biometry Courses. The Haag-Streit Academy has developed an extensive calendar of CPD-approved interactive courses which are hosted UK-wide.

Access a variety of materials designed to help you get the most from our products. From demonstration videos and webinars to publications, studies, and best-practice documents – explore resources that provide practical guidance, application insights, and product knowledge, available whenever and wherever you choose to learn.

At Haag-Streit UK, we are always happy to support our customers with any queries on our range of products. As a first port of call, we have put together a comprehensive list of biometry frequently asked questions.  

The HS-UK Service Department has a comprehensive range of service contract options available for your Lenstar, as well as ad-hoc repair solutions in response to a breakdown or faulty equipment. As the authorised UK service agent of the Haag-Streit Lenstar, we use only specialist manufacturer tools to check for free and correct movement of all axes, carry out a complete measurement check and a full polarisation calibration.