author(s)
P Sanel, SK Jhirwal and TK Gahlot

abstract
ERG findings including rod, combined rod-cone, single-flash cone, and 30-Hz flicker responses were recorded with an LED-electrode in 40 eyes of 21 dogs divided into two groups using the HMsERG system. 20 eyes of 10 dogs had no vision abnormality (Group I) and rest of the 20 eyes of 11 dogs had various ocular abnormalities (Group II). Significant differences in relation to normal and affected eye were observed for the mean values of amplitude a-wave and b-wave for rod, combined rod-cone, cone and flicker responses between group I and group II (p < 0.01). Significant differences in b/a wave ratio of amplitude were observed for the mean values recorded for combined rod-cone and cone responses between group I and group II (p < 0.05). Thus, ERG is useful adjunct test for the diagnosis of retinal dystrophies and for pre-operative evaluation of retinal functions in conjunction with cataract surgery.