cdTodb

Given a value in cd/\(\mbox{m}^2\), return the equivalent dB value.
Default is to use HFA units, so maximum stimulus is 10000 apostilbs.

Implementation of the Open Perimetry Interface (OPI) for simulating and controlling visual field machines using R. The OPI is a standard for interfacing with visual field testing machines (perimeters) first started as an open source project with support of Haag-Streit in 2010. It specifies basic functions that allow many visual field tests to be constructed. As of February 2022 it is fully implemented on the Haag-Streit Octopus 900 and 'CrewT ImoVifa' ('Topcon Tempo') with partial implementations on the Centervue Compass, Kowa AP 7000 and Android phones. It also has a cousin: the R package 'visualFields', which has tools for analysing and manipulating visual field data.

Andrew Turpin

Open Perimetry Interface

David Lawson

Ivan Marin-Franch

Matthias Muller

Jonathan Denniss

Astrid Zeman

Giovanni Montesano

cdTodb function

<dl><dt>cd</dt>
<dd>Value to convert to dB in cd/\(\mbox{m}^2\). Must be &gt; 0.</dd>
<dt>maxStim</dt>
<dd>Stimulus value for 0dB in cd/\(\mbox{m}^2\).</dd></dl>

Arguments

Convert cd/\(\mbox{m}^2\) to perimetric dB. — cdTodb

<dl>

<dt>cd</dt>
<dd>Value to convert to dB in cd/\(\mbox{m}^2\). Must be &gt; 0.</dd>


<dt>maxStim</dt>
<dd>Stimulus value for 0dB in cd/\(\mbox{m}^2\).</dd>

</dl>

cdTodb: Convert cd/\(\mbox{m}^2\) to perimetric dB.

Description

Usage

Value

Arguments

Examples