Fig. 3.

Multifocal ERGs recorded to a 103-element stimulus array in a representative normal subject (a), in a case of retinitis pigmentosa showing relative sparing of central macular function (b), in a case of macular dystrophy showing reduction over a central area (c) and in a patient with an eccentric nasal area of retinal dysfunction consistent with an enlarged blind spot extending inferiorly in the right eye (d). MfERGs in cases a–c showed a high degree of inter-ocular symmetry; abnormalities were unilateral in d. Traces are shown in retinal view