We use gonioscopy to examine the angle between the iris and the cornea (filtration angle). It is exactly where the liquid (aqueous humour), which is continuously produced inside the eye, floods out.
The ophthalmologist observes this particular structure of the eye anatomy to make sure the angle is correctly open so that the aqueous humour can flood out. If not and if the angle tends to close, the pressure inside the eye could increase. We use gonioscopy to detect glaucomas, to identify them and to make a therapeutic decision.
Currently, the ophthalmologists perform a manual gonioscopy examination, using a slit lamp and a lens that comes in contact with the patient’s eye. Today, NIDEK goniolens GS-1 makes possible to automating the gonioscopy examination and the record of images. We use this equipment to produce a completely new imaging of the filtration angle over its entire circumference.
Automated gonioscopy also provides a quicker and more frequent access to filtration angle data and makes the following-up of patients easier.
The NIDEK gonioscopes GS-1 is equipped with an acquisition cone specially designed to view the filtration angle. This prismatic lens includes a Goldmann lens made with 16 faceted mirrors. Each mirror surface is covered with an external silver layer, optimised to reflect the light under a 61° angle, specific to view this anatomic zone.
The reading takes only 15 seconds. This multi-mirror cone can acquire a colour image of the filtration angle over 360°.
Gonioscopy is an essential step of the examination of a glaucomatous patient, as it makes possible precising the diagnosis and orientating the therapeutic support. The goniometry principle is based upon the static and indirect visualisation of the angle. Once automated, the image acquisition makes performing this complex examination easier.
A white LED light is projected into a prismatic lens comprising 16 mirrors successively reflecting the light. A camera is set inside the gonioscopes to capture the images that will then be automatically assembled by the software (“image stitching”). The gonioscopes GS-1 then provides the image of the unwound angle, so that it can be viewed in a linear or circular way, depending on your choice.
Gonioscopy is an essential step of the examination of glaucomas. It makes possible precising the diagnosis and orientating the therapeutic support. The goniometry principle is based upon the static and indirect visualisation of the angle. Once automated, the image acquisition makes performing this complex examination easier.
* Images avec l’aimable autorisation du Professeur Jean-Paul Renard, France.
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