According to Archer, these watches are inspected by an 'unaided' eye at a distance of 30 cm. (If I remember correctly). If the imperfection cannot be seen, it's within Omega tolerances.
'We' just look too closely at these watches, I'm terrible for it. I don't know why I do it, I really don't.
Whenever I look at my watches with a loupe, I find something, I wish I hadn't seen!