No connection. Shingles (zoster) affects one nerve root. If it's the trigeminal nerve root, there can be other consequences, but blindness is in any case very rare, and only a consideration if the forehead and tip of the nose are involved. If the nerve on the back is involved, it can't affect your face, so you needn't worry. If you have additional questions, your doctor should be able to straighten you out.
Take care.
Dr. Rockoff
Thanks Dr. Rockoff. For clarification is it possible to have shingles on the back and then days later get shingles on nose/forehead? If so could Trigeminal neuralgia be a precursor to this?
Regards