when quality VA with etdrs to logmar, returning 1.7

[tjebo]

to_logmar(c("nlp", 34), from = "etdrs")
#[1] 1.70 1.02

to_snellen() works as expected:

to_snellen(c("nlp", 34), from = "etdrs")
#[1] "20/20000" "20/200"  

[tjebo]

current suggested workaround: to_logmar(to_snellen(x)).
This is not ideal, I'll fix this ASAP

[tjebo]

with current dev version - still need to work on the conversion to logmar, but it's already better.

> to_snellen(c("nlp", "lp", 34), from = "etdrs")
[1] "20/20000" "20/10000" "20/200"  
> to_logmar(c("nlp", "lp", 34), from = "etdrs")
[1] 6.14 3.92 1.02

[tjebo]

fixed with current dev version

> to_snellen(c("nlp", "lp", 34), from = "etdrs")
[1] "20/20000" "20/10000" "20/200"  
> to_logmar(c("nlp", "lp", 34), from = "etdrs")
[1] 3.00 2.70 1.02