You cannot treat anyone until a diagnosis is made, or at least symptom control or empirical treatment. Its quite possible to attend a clinic or hospital for investigations and not be treated. I understand that in this instance, there is an attendance at a clinic for an eye problem.
It is not unusual for someone to present with a physical set of symptoms which either consciously or unconsciously cause the person to go to a doctor.
Conscious or deliberate attendance? Perhaps the person wanted to speak to a doctor but his employment would put him in some kind of jeopardy if he reported mental difficulties. Best go to the doctor with en eye problem?
Classic is the diabetics in the UK - plenty of type 2 DM HGV drivers who are fine so long as they are aware of the potential problems of one or two of the drugs. However some Type 2's end up up on insulin and that is a no no for the HGV licence - hence some reluctance to attend for monitoring of the condition.