What is the 20/20 line on an eye chart?

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Tags

1. #person
2. #formally
3. #aloud
4. #indicates
5. #reads
6. #symbols
7. #covers
8. #known
9. #chart
10. #metres
11. #optotypes
12. #accurately
13. #letters
14. #visual
15. #taking
16. #specific
17. #acuity
18. #beginning
19. #smallest