va_dissect

<p>Used in <code><a rd-options="=va" href="/link/va()?package=eye&version=0.1.0&to=%3Dva" data-mini-rdoc="=va::va()">va()</a></code> if  <code><a rd-options="=which_va" href="/link/which_va()?package=eye&version=0.1.0&to=%3Dwhich_va" data-mini-rdoc="=which_va::which_va()">which_va()</a></code> finds "mixed" VA notation.
Converts each VA vector element individually - requires the VA vector to
be prepared with <code><a rd-options="=clean_va" href="/link/clean_va()?package=eye&version=0.1.0&to=%3Dclean_va" data-mini-rdoc="=clean_va::clean_va()">clean_va()</a></code> first.</p>

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>.

Tjebo Heeren

Analysis of Eye Data

Antoine Fabri

va_dissect function

<p>Used in <code><a rd-options='=va' href='va()'>va()</a></code> if  <code><a rd-options='=which_va' href='which_va()'>which_va()</a></code> finds "mixed" VA notation.
Converts each VA vector element individually - requires the VA vector to
be prepared with <code><a rd-options='=clean_va' href='clean_va()'>clean_va()</a></code> first.</p>

va_dissect: Converting each VA element

Description

Usage

Arguments

Value

See Also