A new direction in visual fields

Introducing 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.

Fundus-related perimetry

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.

Fundus-related perimetry

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.

Fundus-related perimetry

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.

Essential technology

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.

Essential technology

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. 

Essential technology

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.

Essential technology

Retinal tracking

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. 

Great ergonomic advantages

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.

Great ergonomic advantages

Touch-screen interface

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.

Great ergonomic advantages

Patient positioning

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.