which_va

which_va_dissect

strings for qualitative visual acuity entries

quali

elem

chose logmar when guessing between two notations

from_logmar

Guessing the VA notation (VA class). Requires x that was
prepared with <a rd-options="" href="/link/clean_va?package=eye&version=0.1.0" data-mini-rdoc="eye::clean_va">clean_va</a><ul>
<li><code>which_va</code>: guessing VA class for entire vector</li>
</ul><ul>
<li><code>which_va_dissect</code>: guessing VA class for each vector element</li>
</ul>

internal

A tool to facilitate common tasks in ophthalmic research:
Conversion between different visual acuity notations (Snellen, logMAR
and ETDRS), counting of patients, recode right and left eyes and reshape
eye side specific variables between wide and long format. The 'eye'
package also contains a real life data set of people with intravitreal
injections with anti-vascular endothelial growth factor (anti-VEGF),
made available by Fasler et al. (2019) <doi:10.1136/bmjopen-2018-027441>.
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>.

which_va: Guessing the VA class

Description

Usage

Arguments

Value

See Also