Remote Acuity Testing

Outline instructions

Remote acuity testing using Thomson Test Charts


Create a meeting and send the patient a meeting invitation link.


Add the patient to the meeting when they log in. You can then welcome them and explain the procedure by video link.


Run the Thomson Test Chart software on your computer and select Share screen in the video-conferencing app


Select Options ... Screen calibration within the Test Chart software. This will display a large letter E on the patient's screen which they should measure on their screen using a ruler.

You then enter this value into the Test Chart software along with the longest viewing distance that they can achieve from their computer (e.g. 250 cm). The letter size will then be correctly calibrated for the patient's screen size and viewing distance.


The patient then stands (or sits) at the required distance from their screen while you display an appropriate test chart.

The patient can be given appropriate instructions and encouragement via the videolink while you can monitor that they are following those instructions.