Ocular biometry

Ocular biometry is an examination that measures the length of the eyeball.

What does ocular biometry involve?

Ocular biometry is performed according to two techniques:

Ultrasound biometry – ultrasound emitted into the cornea, requiring eye contact and anesthesia. It is invasive for patients and takes longer to perform.

IOL MASTER optical biometry – uses infrared laser light, is non-invasive to patients and no anesthetic or dilating eye drops are required.

Optical biometry is the most commonly used today because it provides a more accurate calculation, except in very specific cases (crystalline lenses strongly affected by cataract, very opaque).

IOL MASTER technology uses infrared cameras to capture the unique patterns of the eye. These patterns are then converted into a template, providing automatic near 100% fit rates for the artificial lens.

Recognition scanners work by illuminating the iris with invisible infrared light, detecting and excluding eyelashes, eyelids and specular reflections that usually block parts of the iris.

When is ocular biometry used?

This investigation is necessary for:

Cataract and presbyopia surgery by lens implants (artificial lens that replace opaque or aged natural lens).

Surgery to correct refractive errors (myopia, hypermetropia, astigmatism, etc.) with artificial lens.

Text medically reviewed by Dr. Teodor Holhoș, Ophthalmic Surgeon
Written by Dr. Holhos Team

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Information note on examination within the Dr. Holhoș Ophthalmology Network

Dr. Holhoș Ophthalmology Network reserves the right to request payment in advance (by payment order or in cash at the reception desk of network clinics) from patients who:

– Cancel two consecutive appointments at our clinics


– do not attend two consecutive appointments at our clinics.

Thank you for your understanding!