I have done many vision field tests and have never had any problems with them being done in quiet comfortable conditions. My recent DVLA field at Specsavers was very stressful and my performance was greatly hindered because of the following:
The Zeiss HFA 3830 test machine was at the back of the shop, cramped in the corner of an area, without a door. This area had other equipment close to the test machine and I think it was being used by some members of staff during my test. They were talking quite loudly and really affected my concentration.
I am blind in my right eye so only my left eye was being tested. In the past I have always placed chin on the left chin rest but this time I was asked to place my chin on the pointy midpoint of the W shape between the left and right chin rests. This unusual procedure really stressed me but the operator insisted it was to keep my chin in the middle. If any members with monocular vision have done the DVLA test, please let me know where your chin was positioned.
The third problem was the fact you have to focus on the light on the screen. My varifocal glasses were not suited to the distance of the light so the light was blurred. In previous tests the pop up lens on the machine has provided the correct prescription to bring the light into focus but this could not be used because my chin was not on the rest.
When the test was running I could see either the mechanism or the shadow of it moving back and forth on the top of the screen. My sight was distracted to this instead of the light.
My advice to any anyone due the test is to visit the Specsavers before booking and if not satisfied with the set-up try a different branch. My test three years ago was perfectly satisfactory.