I was referred to the eye hospital a few years back following "something" showing up on annual screening. Specialist said nothing actively going on now, was probably a one-off, no treatment, just come back in 3 months. Next time all trace had gone and no new signs so was discharged with usual advice to maintain good control.
Which was ironic since this was after hospital cockups made me wait 15 months for a continuous monitor. Worried I was (again) sleeping through hypos but was firmly told not to test during the night! Repeatedly told monitor would be very soon and not to alter basal before then either. Was actually running high all night, which I'd have known and addressed if I'd tested. Later emerged they had no DSNs trained in use of continous monitor all that time... consultant's grovelling apology was all very well but did not undo my raised HbA1c.. would've been really angry if needed laser treatment as a result of their expert advice!