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The ultrasound scanning is a biometry and imaging examination using an ultrasound sound beam. On one hand, it makes possible measuring the different eye-structure lengths (axial length, cornea or crystalline lens thickness) and on the other hand rebuilding a 2D view (section) of the eye, particularly the fundus (retina). It can also be used to observe the tissues around the eye and the orbit.
Il est principalement utilisé lorsque les milieux internes de l’œil ne sont plus assez transparents (cataracte dense, hémorragies, inflammations…) et empêchent le passage correct de la lumière (utilisée par les biomètres optiques ou la lampe à fente).
Depending on the examination mode, there is a contact with cornea (echo A) of the eyelid (echo B). The doctor has to be careful to correctly perform the examination. Using a different probe, it is also possible to measure the cornea thickness, as it a precious value to follow-up glaucomas or detect some pathologies. In this case, the probe is applied on the cornea.
The ultrasound scanner US-4000 proposes eye biometric analyses, with the measure of the axial length, thanks to the ultrasound technology in mode echo-A, and 2D sections of the eye in mode echo-B. The option US-4000P is, in addition, equipped with a probe dedicated to measuring the thickness of the cornea, or pachymetry.
The ultrasound scanner US-500 proposes eye biometric analyses, and particularly the axial length, thanks to the ultrasound technology in mode echo-A. The option US-4000P is, in addition, equipped with a probe dedicated to measuring the thickness of the cornea, the pachymetry.
Ultrasound scanning is an examination using a high-frequency ultrasound sound beam the human ears cannot hear. Thanks to the reflexions of the beam, resulting from structure-composition differences produced when the beam goes through the eye, the ultrasound scanner collects echos to calculate anatomical lengths with a high precision or to rebuild a 2D image (section) using two-dimensional scanning.
As the sound propagation velocity in the different media of eye are known, the lengths are measured depending on the echo RTT.
If the sound beam scans a 2D surface, echos are assembled to rebuild a 2D image, i.e. a section of the probed structure. As it is not limited by haemorrhages and opacities, the ultrasound scanner is the perfect choice when optical instruments using a light beam are ineffective. It is particularly recommended in case of eye tumours or inflammations. Thanks to a special probe, measuring the thickness of the cornea, or pachymetry, is also possible. This examination means setting the probe on the patient’s cornea, but the value is useful in case a glaucoma is suspected or when scheduling a surgery.
In mode A, only one sound beam is sent through the eye and only its echos are detected. It is then possible to measure the anatomic distances of eye structures (eye total length, crystalline lens or cornea thickness, anterior chamber length, etc.). Mode-A ultrasound scanning mainly applies to the calculation of the intraocular implant, artificial implant replacing the crystalline lens after a cataract surgery, when optical biometers are limited.
Eye biometry with calculation function of the implant, for cataract surgeries.
In mode B, visualisation of the fundus in case of haemorrhage or opaque media.
Option designer to assist glaucoma diagnosis, surgery or the detection of some pathologies.
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