Aj. Hofeldt et al., PULFRICH PSYCHOPHYSICAL STEREO-ILLUSION AND VISUAL-EVOKED POTENTIALS IN EPIRETINAL MEMBRANE OF THE MACULA, Journal of neuro-ophthalmology, 16(1), 1996, pp. 36-40
Six patients with unilateral epiretinal membrane of the macula perceiv
ed the spontaneous Pulfrich psychophysical stereo-illusion, suggesting
a relative conduction delay on the side of the membrane. In three of
these patients, visual-evoked potential studies were also obtained and
confirmed an absolute conduction delay in the anterior pathway on the
side of the epiretinal membrane in two patients and an absence of the
P 100 wave on the side of the epiretinal membrane in the third patien
t. It is important to recognize that the Pulfrich psychophysical stere
o-illusion can be spontaneously perceived in macula disease, and there
fore, the test may not always distinguish optic nerve from macula dise
ase.