Measuring optic nerve head size

[alferec]

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I know that you can measure the ONH size directly 1:1 with a 60D lens, but can somebody tell me what the conversion factor is for a Volk SuperField fundus lens? I know this is pretty tough but I would really really appreciate it!!!

 

[alferec]

Never mind, I found it...the magnification factor is 1.5x:

http://www.ijo.in/article.asp?issn=...=44;issue=4;spage=235;epage=239;aulast=Sekhar

 

[WoodyJI]

I know that you can measure the ONH size directly 1:1 with a 60D lens, but can somebody tell me what the conversion factor is for a Volk SuperField fundus lens? I know this is pretty tough but I would really really appreciate it!!!

GDx is another quick way to get the measurement, but a little more expensive than a fundus lens, unless your clinic already has one.