Hi there,
I sure don't know. But, maybe it's as if they are not large or stand out so much. They should just give the size of them, durrnit, and we'll decide if they are subtle or not - hmpf!
see you around,
-Shell
I would interpret "subtle foci" to mean that even though they are difficult to view, there is evidence that they are present.
Have you seen an opthamologist for a complete vision exam? If the doctor thinks it is neurological, you would want to have a baseline study from now to compare with later.
- Lu