[Verification of multifocal electroretinogram Veris III system for clinical problems].
OBJECTIVE
To verify the usefulness of the Veris III system, which is said to be problematic in clinical applications for recording multifocal electroretinograms (mfERG) by an ophthalmologist.


METHODS
A test wave was input to the system and the data were analyzed using Veris Science software. The items tested were overlapping, spatial averaging, combination procedures, and emission properties of the cathode ray tube (CRT) monitor (B 4).


RESULTS
Overlapping was not observed under the standard stimulus conditions. The data resulting from both spatial averaging and combination procedures coincided with the theoretical calculated data defined by both procedures. Analysis of the emission properties of the CRT monitor showed that it took 85 mu seconds from the beginning to the end of the bright emission.


CONCLUSIONS
No clinical problems were found in the M-sequence program, the spatial averaging procedure, or the combination procedure using several test waves. It is necessary to pay attention to the configuration of pattern stimulation on the CRT monitor (B 4), because it has a very steep emission during a very short time.
Yoshii
Masaru
M
Eye Clinic, National Rehabilitation Center for Persons with Disabilities, Saitama, Japan.
Nagasaka
Eiichiro
E
Yanashima
Kenji
K
Hayashi
Hiromi
H
D004596:Electroretinography / Q000295:instrumentation*; D012984:Software