Test phase 1

In Single-stimulus Screening mode, each stimulus is presented individually at 5dB above the working threshold.  The patient is simply asked to press the Space bar if they detect a "dot flash".  No response within the pre-defined Timing period is taken a stimulus "Not seen".  In dual screen mode mode, the position of the stimuli is displayed on the control screen and the examiner clicks on the corresponding buttons on the control screen.  The control screen also displays the patterns of stimuli where the number identified was correct (green) and those where the number identified was incorrect (red).



Test phase 2

Having presented all the stimuli in the stimulus set, the software then re-presents any stimuli that were not seen first time around.


Screening mode

If Screening mode has been selected, the software will simply record the location of any stimuli that were not detected at 5dB above the working threshold, but will make no attempt to further quantify the loss of sensitivity.


The report for tests conducted in screening mode simply shows any stimuli which were not detected at 5dB above the working threshold (red) against a background of those detected (green).

Threshold mode

If Threshold mode has been selected, the software will attempt to quantify the loss of sensitivity for any stimuli identified during Test phase 3, by increasing the stimulus luminance in 1dB steps until the stimulus is seen (or the maximum luminance is reached).


The report for tests conducted in threshold mode show any points not seen at 5dB above threshold appropriately colour coded (heat scale) depending on the depth of the scotoma.


Manually entering a response for individual stimuli

The response for individual stimuli may be entered manually by Right Clicking on the stimulus. This will display a panel next to the stimulus as shown below.  The examiner may then record if the stimulus was Seen or Not seen.  Th individual stimulus may be presented by clicking on Present. If a result is entered manually, this pattern will be exempted from Test phases 2 and 3.