My wife had her annual eye test at Boots a couple of years ago and they offered to take pics of her retina. The opthalmologist said she was concerned about a dark spot on the retina and some months later came a summons to attend the eye clinic. After a really thorough examination the consultant assured my wife that it was just a change in the pigmentation, absolutely nothing to worry about and discharged her immediately.
I hope your problem proves to be equally simple.