Ocular Biometry

At Peel Vision, we use the start-of-the-art Lenstar LS-900 from Haag-Streit USA technologies. This highly advanced optical biometer captures multiple vital eye measurements within seconds, in a single scan.

What is optical biometry?

In simple terms, optical biometry is the measure of the size and shape of the eye. Biometry measurements are most commonly used before cataract surgery to determine the most suitable intraocular lens implant for each patient. Precise biometry is essential for best visual outcomes in cataract surgery

Optical biometry uses light waves to measure various parameters of the eye and their relationship to each other, and has replaced older techniques that used ultrasound (sound waves).

The Lenstar is the first biometer to use the advanced technology of OLCR (Optical low Coherence Reflectometry) for all its measurements. It captures 9 vital measurements of the entire eye in 30 seconds in 1 scan. An advanced computer then analyzes this data using multiple lens-calculation formulae and predictive mathematical modeling to determine the most appropriate lens implant for a given eye.

The Lenstar also employs a unique and proprietary intelligent fixation system, that ensures that all measurements are taken on the patient’s visual axis, which is crucial for accuracy. If the system detects that a patient blinks or loses fixation during measurements, then scans are halted and only resumed when fixation is re-established.

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How is optical biometry performed?

Our experienced Ophthalmic Assistants will perform optical biometry on patients prior to cataract surgery. Dr Then will then carefully analyse these results and choose the most appropriate intraocular lens, based on these results, and the unique visual needs of each individual patient.

Patients are comfortably seated in front of the machine, and their chin placed in an electronically-adjustable chin rest. Each eye is tested separately, and the eye not being tested is covered. Patients will be directed to focus on a lighted target, and each scan should take no longer than a few minutes to perform. Often, multiple scans are done per eye to ensure the highest level of accuracy, precision and consistency is achieved.