Lenstar LS 900

What is it?

Lenstar LS 900 uses the optical low-coherence reflectometry (OLCR) technique to measure the length of your eyes in a single measurement scan. The OLCR technique allows for a precise and non-contact measurement of eye length. Lenstar LS 900 is manufactured by Haag-Streit, a leading and reputed Swiss Medical Company.

How does it work?

Lenstar LS 900 captures the axial dimensions of all the structures in your eyes from the clear outer layer of the cornea to the light-sensitive retina at the back. The Lenstar LS 900 utilizes the latest, state-of-the-art laser light to measure every section of your eye, including the thickness of your lens. Measurements are obtained by calculating the interference between the laser beams reflected by the different surfaces within the eye.

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What are its uses?

Measurement of the on-axis and off-axis dimensions of the eye is important to determine the shape of the eye, which is paramount in the progression of refractive errors. 

Lenstar LS 900 is also a precise tool for accurately calculating the power of the intraocular lens, which is placed in your eye following cataract surgery. This can help your eye surgeon to plan your surgery.

In addition, measures your corneal curvature which is a key tool in the diagnosis of astigmatism. Lenstar LS 900 measures the white-to-white distance, the horizontal corneal diameter used in diagnosis and treatment of congenital glaucoma, and micro- and megalocornea.

What to expect while undergoing the test with the machine?

You will be asked to be seated with your chin set on the rest and forehead leaning forward. You will be required to fix your gaze on a central light without moving your eyes. The test lasts for a few seconds.

Are there any side effects?
None, as measurements are non-contact. It is possible to carry out any day-to-day activity after the procedure.

What are the advantages?

Lenstar LS 900 provides a complete biometrical assessment of your eye in less than thirty seconds. It can provide seven measurements in a single procedure that include:

  • The thickness of your cornea (pachymetry)
  • The thickness of your lens
  • The corneal radius of curvature (keratometry)
  • Pupil size and reactivity (pupillometry)
  • Axial eye length
  • Distance between cornea and lens (anterior chamber depth) 
  • Horizontal corneal diameter (white-to-white)
How to prepare for the test?
If you use contact lenses, you should temporarily discontinue use before testing. It is recommended to stop using contacts 24 to 48 hours before measurements.