CD, lesions on the retina are extremely common & 99% of the time nothing to worry about. BIL (in Spain) just went through this & he, too, wanted me to ask my father for advice, having jumped to the same dramatic conclusions that you had. But as my father predicted, his lesion was nothing to worry about.
The fact is that opticians don't have the training to diagnoseor dismissretinal peculiarities, so they always refer the patient on to an ophthalmologist. I know that getting the referral is scary for you as the patient, but that have to do it.
Nevertheless, I will e-mail my dad with the specific details of your report. . .and we'll see if I'm right! I may not be able to get back to you with this immediately, though--depends on when he gets the e-mail etc.