Opticians these days seem to refer people for tests at the slightest reason, not sure why this has started to happen in the last few years (maybe a liability thing) but at my local hospital the eye department is standing room only there's so many people there. I was also referred a few years ago with high pressures, turned out to be nothing, try and look at the positive thing here: If there's anything wrong (very unlikely!) it has been caught so early it can be treated