The Test-Retest Reliability of the Photopic Negative Response (PhNR).
OBJECTIVE
The photopic negative response (PhNR) may be useful as a tool to monitor longitudinal change in retinal ganglion cell (RGC) function. The goal was to assess PhNR test-retest reliability, and to estimate the amount of change between tests that is likely to be statistically significant for an individual test subject.


METHODS
Photopic electroretinograms (ERGs) were recorded from 49 visually normal subjects (mean age, 38.9 years; range, 21-72 years). Signals were acquired using Dawson-Trick-Litzkow (DTL) electrodes in response to red stimulus at four flash energies (0.5, 1, 2.25, 3 cd·s/m2) on a blue background (10 cd/m2). The PhNR amplitude was recorded from prestimulus baseline to trough (BT), prestimulus baseline to fixed time point (BF), and b-wave peak to trough (PT). The ratio of baseline PhNR to b-wave amplitude (BT/b-wave) was calculated. Reliability was assessed using the intraclass correlation coefficient (ICC2,1) and coefficient of repeatability (CoR).


RESULTS
Flash energy of 1.00 cd·s/m2produced reliable, well-defined traces. At this stimulus, the a- and b-wave amplitudes were reproduced with moderate reliability (ICC, 0.62; CoR%, 90.0%; and ICC, 0.74; CoR%, 54.3%; respectively). For PhNR, the order from most to least reliable measurement was: PT (ICC, 0.64; CoR%, 59.1%), BT (ICC, 0.40; CoR%, 148.3%), and BF (ICC, 0.22; CoR%, 166.1%). The BT/b-wave did not improve reliability (ICC, 0.37; CoR%, 181.5).


CONCLUSIONS
The b-wave peak-to-PhNR trough amplitude produced the most reliable measurement.


CONCLUSIONS
A relatively large magnitude of change in PhNR amplitude is required to make clinical inferences about changes in RGC function. Refinement to the technique of acquisition and/or processing of the PhNR is recommended to improve reliability.
Centre for Eye Research Australia, Melbourne, Australia.
Jessica
J
Tang
The Royal Victorian Eye and Ear Hospital, Melbourne, Australia.
Thomas
T
Edwards
Centre for Eye Research Australia, Melbourne, Australia ; The Royal Victorian Eye and Ear Hospital, Melbourne, Australia.
Jonathan G
JG
Crowston
Centre for Eye Research Australia, Melbourne, Australia ; RMIT University, Melbourne, Australia.
Marc
M
Sarossy
electroretinogram; glaucoma; photopic negative response; reliability; statistics