The following are true about electro-retinography?
a. flicker ERG can be used to test cone function
b. ERG is normal in patient with macular degeneration
c. the a-wave of ERG is produced by the ganglion cells
d. the b-wave is produced by the photoreceptor cell
a. flicker ERG can be used to test cone function
b. ERG is normal in patient with macular degeneration
c. the a-wave of ERG is produced by the ganglion cells
d. the b-wave is produced by the photoreceptor cell