Doubled score with one's normal acuity (6-6)
I believe the answer is:
twenty-twenty
'one's normal acuity' is the definition.
I can't judge whether this definition defines the answer.
'doubled score' is the wordplay.
'doubled' shows that letters should be duplicated.
'score' becomes 'twenty' (synonyms).
'twenty' doubled is 'TWENTY-TWENTY'.
'with' is the link.
Can you help me to learn more?
(Other definitions for twenty-twenty that I've seen before include "Normal (as of five days ago?)" , "Denoting normal vision" , "Perfect vision" , "Normal eyesight" .)