B. Brown et Mkh. Yap, CONTRAST AND LUMINANCE AS PARAMETERS DEFINING THE OUTPUT OF THE VERISTOPOGRAPHICAL ERG, Ophthalmic & physiological optics, 16(1), 1996, pp. 42-48
The Visual Evoked Response Imaging System (VERIS I) topographical elec
troretinogram system (EDI Associates, San Francisco, CA) allows measur
ement of the response of large numbers of retinal areas simultaneously
. This paper examines ERG responses derived with the VERIS system to c
hanges in target contrast and to local reductions in luminance. There
is a linear reduction of response with reductions of target contrast.
Neutral density filters were placed over part of the display, to mimic
the localised reductions in response which occur in glaucoma, age-rel
ated maculopathy or diabetic retinopathy. There is a definite reductio
n in response seen with a 0.4 ND filter, indicating that the system sh
ould have similar sensitivity in detection of retinal lesions to the c
ommonly used visual field analysis systems.