va_chart

Conversion between snellen, logMAR and ETDRS.
Snellen feet, meter and decimal supported. Three qualitative common
vision measures included (light perception, hand movement and
counting fingers). Further details for conversion used can be found in
<a rd-options="" href="/link/va?package=eye&version=1.0.0" data-mini-rdoc="eye::va">va</a> and <a rd-options="" href="/link/va_methods?package=eye&version=1.0.0" data-mini-rdoc="eye::va_methods">va_methods</a>

datasets

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) <http:michaelbach.de/sci/acuity.html>.

Tjebo Heeren

Analysis of Eye Data

Antoine Fabri

va_chart function

A data frame with 29 rows and 5 variables:<dl class="dl-horizontal">
<dt>snellenft</dt><dd>snellen VA in feet</dd>
<dt>snellenm</dt><dd>snellen VA in meter</dd>
<dt>snellendec</dt><dd>decimal snellen VA</dd>
<dt>logmar</dt><dd>logMAR VA</dd>
<dt>etdrs</dt><dd>VA in ETDRS letters</dd>
<dt>quali</dt><dd>VA categories</dd>
</dl>

Format

Conversion between snellen, logMAR and ETDRS.
Snellen feet, meter and decimal supported. Three qualitative common
vision measures included (light perception, hand movement and
counting fingers). Further details for conversion used can be found in
<a rd-options='' href='va'>va</a> and <a rd-options='' href='va_methods'>va_methods</a>

Visual acuity conversion chart — va_chart

A data frame with 29 rows and 5 variables:<dl class='dl-horizontal'>
<dt>snellenft</dt><dd>snellen VA in feet</dd>
<dt>snellenm</dt><dd>snellen VA in meter</dd>
<dt>snellendec</dt><dd>decimal snellen VA</dd>
<dt>logmar</dt><dd>logMAR VA</dd>
<dt>etdrs</dt><dd>VA in ETDRS letters</dd>
<dt>quali</dt><dd>VA categories</dd>
</dl>

va_chart: Visual acuity conversion chart

Description

Usage

Arguments

Format

See Also