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Test Administration
Theia will inform the patient that the test is about to begin. The system will automatically nd and
measure the patient’s pupil, ash a bright light, and start the full test.
The threshold detection algorithm will initiate, and the display screen will indicate the test is underway.
Theia will automatically guide the patient through timed rest breaks. The progress bar will update after
each subsequent rest break occurs.
Upon test completion, the system will pause and display the “Test Complete” screen.
Loosen the adjustable headstrap using the dial and remove the headset from the patient’s head. Using
the handheld controller, the technician must now select the blue button with the white arrow on the
bottom of the screen to acknowledge test completion and move to the next step.
Results Review
• The Rod Intercept (RI) is the time in minutes at which the visual sensitivity recovery is complete.
• The Fixation Error is the percentage of times the patient generates invalid thresholds correlating to a
loss of focus on the xation light and an inappropriate response to the xation light.
• An invalid test will be generated if a patient blinks or averts their gaze during photobleaching,
resulting in dark adaptation that is faster than typically seen in properly bleached patients.
If powered down while on this screen, the unit will allow recovery of results upon reboot. The yellow
check denotes a forced view.
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