Next-generation lens calculation
An optical biometer uses laser light instead of ultrasound to measure the eye with exceptional precision and without touching the surface. It captures axial length, corneal curvature and other parameters in a single, comfortable scan.
Ideal for premium IOLs
This level of accuracy is particularly important when planning multifocal or toric intraocular lenses, where even small measurement errors can affect the final visual outcome.
What is optical biometry?
Optical biometry is a no-touch measurement of the eye's dimensions using laser light rather than ultrasound. It is also known simply as eye biometry, and the instrument that performs it is called an optical biometer. Because the laser does not touch the eye, the scan is comfortable and very precise. These measurements are used to calculate the power of the intraocular lens (IOL) implanted during cataract surgery.
What does an optical biometer measure?
An optical biometer captures several measurements in a single scan. These include the axial length (the front-to-back length of the eye), keratometry or corneal curvature (how steeply the cornea is curved), the anterior chamber depth (the space between the cornea and the lens), the lens thickness, and the white-to-white distance (the horizontal diameter of the cornea). Each of these helps the surgeon select the most suitable lens and predict the visual result more accurately. The more complete the measurements, the better the lens choice can be tailored to your eye.
Optical biometry vs ultrasound (A-scan) biometry
Both optical biometry and A-scan ultrasound biometry measure the eye to help calculate lens power, but they do so differently. Optical biometry uses laser light and does not touch the eye, which makes it comfortable and highly precise. A-scan biometry uses sound waves and may involve a probe gently resting on the eye, and it remains very useful in cases where a dense cataract blocks the laser. Your doctor selects the most appropriate method for your eye.