Using the automatic distance tracker (default):

  1. Enter the patient’s height in the fields provided (figure 1)

  2. Select the patient’s gender

  3. Guide the patient through the instructions provided on their screen so the patient is in the following position

    • Facing the device with a straight back so their face is fully visible in the camera preview

    • Arms and hands straight out in front of them with their fingertips touching the front of their screen

  4. When the patient is in position, select the ‘Lock tracking’ button

  5. The ECP can now view the patient distance under the video preview (at this stage it will be in red)

  6. Once the patient distance is tracking, select the ‘Next’ button to continue.

The auto tracking works best when the patient is in a bright room. If the auto tracking does not connect (e.g. the patient distance remains as N/A and the ‘Next’ button is inactive), the ECP may need to unlock and re-lock tracking with the patient in position. If the issue persists, manual calibration will need to be used.

Figure 1

Using manual distance calibration:

  1. Manual calibration can be used in place of the auto distance tracking

  2. Select ‘Skip auto tracking’

  3. Guide the patient to the correct position prior to the start of each test

  4. The patient will need a tape measure (or equivalent) to measure out 3m (for distance vision) or 40cm (for near vision) from the device.

  5. Once measured out, they should put an object at that distance so they can remain in the spot for the entire measurement.