Precising Definitions
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
A precising definition reduces vagueness by drawing a line for a purpose.
Show
"Legally blind: corrected acuity of 20/200 or worse." The law needs a cutoff; ordinary usage doesn't have one.
Watch for
The line's placement is a decision, defensible or not — it isn't discovered.