Martin, I'm not too sure about the results and what constitutes a pass or a fail, perhaps a Google search might be helpful here and provide the answer.
When I have my field vision checked the Optician actually tells me if he thinks all is fine, I know they are not meant to and that is a decision for the DVLA to decide but he does say nonetheless, it just a shame yours didn't give any indication but they probably don't want to get people's hopes up or dash them for that matter. I suspect I'll have to have another test in the coming weeks as I'm in the process of renewing my licence.