The evolution of fundus perimetry
The first perimeter capable of performing standard 24-2 visual field testing and delivering true-colour confocal fundus images.
Please tell me more about Compass
Compass is a scanning ophthalmoscope combined with an automatic perimeter. It provides confocal images of the retina, as well as measurements of retinal threshold sensitivity and fixation analysis, under non-mydriatic conditions.
The next level of perimetry
Fundus-related perimetry is a technique that images the retina. It uses a Scanning Laser Ophthalmoscope (SLO) during threshold visual field testing, enabling a correlation to be made between subjective visual fields and objective retinal structure.
Structure & function
Compared to standard automated perimetry, fundus perimetry provides reduced test/re-test variability, true fixation control, increased sensitivity to early defects and a simultaneous assessment of the retinal structure and retinal function.
Comparable to standard 24-2
As a perimeter, the Compass offers a 60° field and is fully-comparable with standard white-white, 24-2 visual fields testing as it contains an age-matched database of retinal sensitivities in normal subjects.
Confocal retinal imaging
As a retinal imager, Compass uses a confocal optical design, similar to SLO systems. It captures colour as well as red-free images of superior quality.
In addition, a high-resolution live image of the retina obtained using infrared illumination is available throughout the test.
30° projection field
Use of fundus perimetry in clinical management of glaucoma has been limited so far, as available systems were lacking compliance with the standards of automated perimetry. Compass overcomes these limitations, extending the field coverage to 30° + 30° and employs luminance parameters and a sensitivity scale, as used in standard automated perimetry.
Colour confocal imaging
Scanning Laser Ophthalmoscope (SLO) systems do not provide colour images as they typically employ monochromatic lasers, resulting in black and white or pseudo-colour images. Compass uses white light instead of lasers, providing true-colour images and a real retinal appearance.
Retinal tracking is at the heart of fundus perimetry. Infrared images, acquired at 25 images-per-second, allow for continuous, automated tracking of eye movements. This allows for highly-accurate test/re-test repeatability. Active compensation of eye movements occurs before and during projection to negate fixation losses.
Easy interaction between operator & patient
Highly-automated and easy-to-use, the Compass has been designed to offer great ergonomic advantages. It combines a visual field analyser and a colour scanning laser ophthalmoscope, to allow easy interaction between the operator, patient and device.
The Compass is easily navigated using the touch-screen interface and test information is subsequently shown on the high-resolution 2560 x 1600 pixel display.
Whilst providing automatic alignment and auto-focusing, the Compass comes equipped with an easy-to-use digital joystick for enhanced manual alignment and focusing.
The ergonomic and fully-motorised chin rest allows for improved cleaning and sterilisation practises, thanks to the silicone material of the patient rest cushions and a detachable front rest.
The patient push-button is designed for improved ergonomics and is easily stored on the side of the Compass, when it is not in use, via a magnetic support.