It was the jet of air test at the opticians that got me the appointment(s) with the consultant approx 1 week later.
The consultant squirted some stinging lubricant/anistetic into my eye and then wound a probe into the surface each of of my eyeballs. All over in the space of a minute and it was pronounced that there wasn't a problem. Despite this the same test was performed a month later in the follow-up appointment. The second appointment included a lengthy field of view test overseen by a nurse. This latter test lasted approx 10/15 minutes per eye.
I assume that the jet of air test is only a rough guide in much the same way as retinal photos at an optician possible only give a general indication of the eye condition as they don't include drops to dilate the pupils. Yearly diabetic eye test photos are performed after applying drops to dilate pupils which afterwards make the eyes very sensitive to sunlight and with a warning that you shouldn't drive for at least 2 to 4 hours.