I have since I found this site tried to test myself .
I was convinced that being without visual imagery was an advantage eg when I ask someone the question -how many 1 cm cubes can you get by dividing a 2 cm cube ? I frequently get a wrong answer and realise they are trying to solve a mathematical problem visually. In other words a visual memory can be false but convincing – identity parades can pick the wrong person. However when I try to visualise my own wife/children/grandchildren’s faces I get blank. If try to visualise a beach we have visited regularly I get a momentary incomplete ghostly and colourless glimpse of a beach scene. but I dream in glorious Technicolor .I should ask visualizers ,if you cant remember something accurately you cant visualise it . I can report something I have witnessed but writing fiction – not a chance.