LKC TECHNOLOGIES RETeval - Reteval Complete Test Results

RETeval Complete Option
RET eval Device User Manual 54
RET eval Complete test results
Incremental results are shown on the RET eval device after each test
(except for flicker-only tests), with the option to repeat the test or
continue to the next test. Successful cursor placement is indicated by
dashed lines on the waveform indicating their location. If you do not see
the successful cursor placement indication, repeat the measurement.
When available, reference interval rectangles indicating the locations of
the middle 95% of subjects with normal vision are shown.
Historical results can be seen from the main menu Results option.
Scroll up and down through the list and select the desired test result.
The results are stored in chronological order; with the most recent result
first. The results include the stimulus, electrical amplitudes, timings, and waveforms recorded
by the electrodes for each eye for each step in the protocol. The graphs display the average
cursor placements. A flash occurs at time = 0 for all tests. When reference intervals are available,
a rectangular box is shown that encloses 95% of the data in the visually-normal test population.
Cursor measurements outside the rectangular box are therefore atypical. Atypical
measurements associated with disease (long times or small amplitudes) are highlighted in red
(i.e., < 2.5% for amplitudes or > 97.5% for times). Measurements close to the border of being
highlighted red (the next 2.5%), are highlighted in yellow. See the Reference Intervals section
in the manual (starting on page 67) for further details.
Just before “Start Test” is pressed in flicker or flash tests, the RET eval device attempts to
measure pupil size regardless of the stimulus type selected. If the pupil is successfully measured,
its diameter will be shown in the PDF report at that test step. If the pupil size is not successfully
measured before “Start Test”, which is possible for “cd” tests, the device will continue to try
measuring the pupil size during the test and will instead report the average pupil diameter during
the test.
Just after pressing “Start Test”, the RET eval device takes an infrared photograph of the eye,
which is displayed on the PDF report. If replicates are taken, the photograph displayed is from
the last replicate. The photograph can be useful to estimate the subject’s dilation state,
compliance, and electrode positioning near the eye.