Changing a ColorDome into a Celeris protocol requires a few simple steps.
Celeris protocols may be made as either Touch/Touch or Active/Reference/Ground. A Touch/Touch protocol uses the opposite eye as a reference, while the Active/Reference/Ground protocol utilizes a needle electrode as a common reference point. The advantage of a Touch/Touch protocol is the simplicity of its setup, however, its drawback is the trans-cranial illumination effect that occurs at intensities greater than 10 cd.s/m2. Active/Reference/Ground is better suited for high intensity stimuli.
At any point in the Protocol Making Process, you may use the "Copy to Node or Step" option to apply a setting to multiple protocol locations. When using this option, read the message carefully and be aware of the differences between Steps, Channels, and Nodes.
Step = a portion of a protocol that is associated with a specific stimulus
Channel = an amplifier input associated with positive and negative pairing
Node = a specific protocol parameter; sub-nodes indicate parameters within a folder
Convert to a Celeris Protocol
When converting a ColorDome into a Celeris protocol, first make a copy of the ColorDome protocol, then change the Stimulator Generator type to "Celeris Stimulator". Click on Parameters to proceed with Protocol Creation.
1. COPY protocol
2. Select "Celeris Stimulator" as the Stimulator Generator
*Note, if you do not see "Celeris Stimulator" as an option, enable Celeris module in Configure System
3. Select "Parameters" to proceed
Enable Both Stimulators
One major difference between ColorDome and Celeris systems is that the ColorDome utilizes one, single stimulator while Celeris utilizes two, individual stimulators. Therefore, Flash Output needs to be changed from "Stimulator 1" to "Both Stimulators".
1. Open stimulus tab
2. Set Flash Output to "Both Stimulators"
3. In order to apply this setting to ALL STEPS of this protocol, select "Node"
4. Read message carefully, and say "Yes" to apply
Configure the Channels Tab for a Touch/Touch Protocol
In order to fully convert a ColorDome protocol into a Celeris Touch/Touch protocol, right and left eyes must both be directed into the Channel 1 input. Since channel is a combination of positive (+) and negative (-), the input plugged into the negative will need to be inverted in order for the graph to appear right-side-up.
1. Set all channels to Amplifier input 1
2. Invert input polarity for even channels; these are the inputs that will be plugged into negative (-) ports
*Note, do this for each Step of the protocol
Configure the Channels Tab for an Active/Reference/Ground Protocol
The setup for Active/Reference/Ground electrode configuration mimics a ColorDome protocol setup. In this setup, Channel 1 is Amplifier input 1 (+) while Channel 2 is Amplifier input 2 (+). Both 1 and 2 (-) are shared via a common reference jumper plug which applies tongue/cheek/snout needle to both channels.
1. Set Channel 1 Amplifier input to 1
2. Set Channel 2 to Amplifier input 2
Choose how the Protocol will Run - for Touch/Touch only
ColorDome protocols produce a single flash that stimulates both eyes simultaneously, while Celeris protocols utilizing the Touch/Touch method stimulate one eye at a time. Thus Diagnosys recommends the following settings:
Single Flash Stimulus:
"Alternate Eyes Between Sweeps" = acquires a sweep from right eye, then left, then right again, until completion of the designated number of "Sweeps per Result"
"Alternate Eyes Between Results" = completes a full stimulation cycle before moving to opposite eye
"Alternate Sweep Between Results" = records multiple results simultaneously
*When making these changes, be sure to do so for each step of the protocol. You may use the Copy to Step or Node options to speed up the process
The Touch/Touch technique requires the need to alternate stimulation between right and left eyes.
Alternation can be done between Sweeps or Results.
Sweeps = individual rounds of data acquisition, multiple sweeps are averaged to create results
Results = average of sweeps, can be thought of as final graphs and data points
"Sweeps per Result" determines how many rounds of data acquisition are averaged together to create a single result; this parameter is found under the Acquisition Tab.
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