OPI (version 1.6)

dbTocd: Convert Humphrey dB to cd/$\mbox{m}^2$

Description

Given a value in Humphrey dB, return the cd/$\mbox{m}^2$ equivalent.

Usage

dbTocd(db)

Arguments

db

Value to convert in Humphrey dB

Value

• Returns cd/$\mbox{m}^2$ value.

References

Please cite: A. Turpin, P.H. Artes and A.M. McKendrick "The Open Perimetry Interface: An enabling tool for clinical visual psychophysics", Journal of Vision 12(11) 2012.

http://perimetry.org/OPI

See Also

cdTodb

Examples

cd <- dbTocd(0)   # 10000/pi
    cd <- dbTocd(10)  # 1000/pi
    cd <- dbTocd(20)  # 100/pi
    cd <- dbTocd(30)  # 10/pi
    cd <- dbTocd(40)  # 1/pi