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Snellen Equiv. Meter Units (M System) Metric American Optical Jaeger (approx) Approx Height (mm) Usual Type Text Size 
20/500 10.00 6/150 J19 15.00 1/2-in. letter
20/250 5.00 6/75 J18 7.50 Newspaper headlines
20/200 4.00 6/60 J17 6.00 Newspaper subheadlines
20/100 2.00 6/30 J11 3.00 Large-print material
20/80 1.60 6/24 J9 2.30 Children's books
20/60 1.20 6/18 J7 1.75 Magazine print
20/50 1.00 6/15 J6 1.50 Newspaper print
20/40 0.80 6/12 J4 1.15 Paperback print
20/25 0.50 6/7.5 J1 0.75 Footnotes
20/20 0.40 6/6 -- 0.58 --