calculate changes in "lines of vision"

NSAspy

Full Member
Oct 28, 2013
41
6
  1. Resident [Any Field]
    I need some help figuring out how many lines someone's vision changed. I get that a change from 20/25 to 20/30 represents a drop by one line etc. I'm struggling with changes in between or beyond the graduations in the snellen chart, say 20/100 to 20/150, or 20/150 to 20/800.

    I'll really appreciate your help, and yes i'm searched around. :)
     

    NSAspy

    Full Member
    Oct 28, 2013
    41
    6
    1. Resident [Any Field]
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