which_va

Guessing the VA notation (VA class). Requires x that was
prepared with clean_va<ul>
<li><code>which_va</code>: guessing VA class for entire vector</li>
</ul>

internal

There is no ophthalmic researcher who has not had headaches from
the handling of visual acuity entries. Different notations, untidy entries.
This shall now be a matter of the past. Eye makes it as easy as pie to work
with VA data - easy cleaning, easy conversion between
Snellen, logMAR, ETDRS letters, and qualitative visual acuity
shall never pester you again. The eye
package automates the pesky task to count number of patients and eyes,
and can help to clean data with easy re-coding for right and left eyes.
It also contains functions to help reshaping eye side specific variables
between wide and long format. Visual acuity conversion is based on
Schulze-Bonsel et al. (2006) <doi:10.1167/iovs.05-0981>,
Gregori et al. (2010) <doi:10.1097/iae.0b013e3181d87e04>,
Beck et al. (2003) <doi:10.1016/s0002-9394(02)01825-1> and
Bach (2007) <https://michaelbach.de/sci/acuity.html>.

Tjebo Heeren

Analysis of Eye Data

Antoine Fabri

which_va function

<dl><dt>x</dt>
<dd>Vector with VA entries</dd>
<dt>quali</dt>
<dd>strings for qualitative visual acuity entries</dd></dl>

Arguments

Guessing the VA class — which_va

<dl>

<dt>x</dt>
<dd>Vector with VA entries</dd>


<dt>quali</dt>
<dd>strings for qualitative visual acuity entries</dd>

</dl>

which_va: Guessing the VA class

Description

Usage

Value

Arguments

See Also