Snellen Chart: Lines

[Commando303]

O.K.: I don't feel like counting pixels or pulling out a ruler. Does anyone know, off the top of his or her head, what the three lines below the 20/20 represent on this Snellen chart:

http://en.wikipedia.org/wiki/File:Snellen_chart.svg?

There are no duplicate sizes, so it must be 20/15, then 20/10, then a smaller line; or, the bottom is a 20/10, and there is no 20/15 (maybe it's a 20/16 followed by a 20/12).

No guesses, please; just share if you know for sure.

Thanks.

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[Commando303]

Never mind: the bottom has to be 20/10. Delete the thread, please (that was quick — ).

 

[Optogal]

I have the actual chart in front of me. It's

20/15
20/13
20/10

 

[Commando303]

I have the actual chart in front of me. It's

20/15
20/13
20/10

Thanks, Optogal. I ending up going with, 20/16, 20/12.5, 20/10. I'll make the corrections, though (12.5 probably is rounded to 13, but I'm not sure how the hell accurate these measurements are, anyway, so I'll save myself the decimal point).

 

[JennieJoy]

We use the bailey lovey near chart at our lines are 20/16, 20/12.5, and 20/10. Maybe snellen rounds differently.

 

[Commando303]

We use the bailey lovey near chart at our lines are 20/16, 20/12.5, and 20/10. Maybe snellen rounds differently.

Frankly, I'm sick of this pig-**** "20-ft. notation" thing, altogether. Diopters are inverse meters, prism diopters are lateral displacement (in cm.) per meter, P.D.s are taken in millimeters, near acuities are (often) reocrded in M-notation (which is based on a .4-meter testing-distance)... I hereby vow to henceforth use 6/6-notation — !

 

[syma]

Frankly, I'm sick of this pig-**** "20-ft. notation" thing, altogether. Diopters are inverse meters, prism diopters are lateral displacement (in cm.) per meter, P.D.s are taken in millimeters, near acuities are (often) reocrded in M-notation (which is based on a .4-meter testing-distance)... I hereby vow to henceforth use 6/6-notation — !

Hear, hear!