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USER MANUAL
RETEVET™ PORTABLE ERG
T +49 7461 96 580 0 | F +49 7461 96 580 90 | export@eickemeyer.com | www.eickemeyer.com
3. CHOOSING A PROTOCOL
The RETevet™ device enables you to change the stimulus conditions (called protocols) to best meet your needs via a protocol
chooser. The RETevet™ protocols have fl icker and single fl ash stimuli to provide the complete assessment of the retinal
function.
Flicker ERG Testing
The RETevet™ device supports fl icker ERG testing, as a fast and easy way to assess the functioning of the cone pathways. The
RETevet™ device measures fl icker implicit time quickly and accurately by fl ashing light into the patient’s eye and measuring
the time delay (implicit time) and amplitude of the retina’s electrical response as detected on the eye electrode.
Brief fl ashes of light are provided at the beginning of each 28.3 Hz stimulus period. Background illumination, where present,
uses a pulse-width-modulation (PWM) frequency near 1 kHz. Flicker protocols typically record between 5 and 15 seconds of
data for each stimulus condition stopping after an internal precision metric is reached. Some protocols have multiple stimulus
conditions which are presented sequentially with a short (< 1 s) dark pause between the conditions. A counter on the screen
shows progress for these multi-stimulus protocols.
The RETevet™ device provides fl icker intensities of 3 and 10 cd·s/m² without a background light and the ISCEV standard
3 cd·s/m² fl ash with a 30 cd/m² background. If you are unsure which stimulus to use, the ISCEV standard is recommended.
Flicker: 3 cd·s/m²
Description
Eye Flash Luminance Energy
(0.33, 0.33 White) Background Luminance
(0.33, 0.33 White) # Flashes
Light adapted 3.0 fl icker Right 3 cd·s/m² @ 28.3 Hz Off 141 – 424
Light adapted 3.0 fl icker Left 3 cd·s/m² @ 28.3 Hz Off 141 – 424
Flicker: 10 cd·s/m²
Description
Eye Flash Luminance Energy
(0.33, 0.33 White) Background Luminance
(0.33, 0.33 White) # Flashes
Light adapted 10.0 fl icker Right 10 cd·s/m² @ 28.3 Hz Off 141 – 424
Light adapted 3.0 fl icker Right 10 cd·s/m² @ 28.3 Hz Off 141 – 424
Flicker: 3 cd·s/m², 30 cd/m² bg
Description
Eye Flash Luminance Energy
(0.33, 0.33 White) Background Luminance
(0.33, 0.33 White) # Flashes
Light adapted 10.0 fl icker Right 3 cd·s/m² @ 28.3 Hz 30 cd/m² 141 – 424
Light adapted 3.0 fl icker Left 3 cd·s/m² @ 28.3 Hz 30 cd/m² 141 – 424