The influence of argon laser panretinal photocoagulation on the rabbit ERG c-wave.
We observed the influence of panretinal photocoagulation on the ERG c-wave in rabbit eyes. DC-registered ERGs were recorded from rabbit eyes before and after photocoagulation, and compared with those of the fellow eyes. The rabbits were subdivided into 3 groups according to application numbers: 500, 1000, and 1500 spots. The ERG c-waves were found to have totally disappeared in all rabbits 3 days after panretinal photocoagulation, then reappeared with various intervals. In the 500 spot group, the c-wave reappeared after one week, and almost reached control levels in one and a half months. In the 1000 spot group, a 10 day delay was noted, and 90% of control levels were regained after 6 months. In the 1500 spot group, the c-wave didn't reappear until 2 weeks later, and regained 70% (of the control level) after 6 months. The recovery rates were related to the number of laser applications. These results indicate that the ultimate degree of recovery in c-wave amplitude and the time required for the reestablishment of retinal pigment epithelium function both depend on the size of the coagulated area.
Chuang
H C
HC
Department of Ophthalmology, Faculty of Medicine, Kyoto University, Japan.
Kawano
S
S
Arai
M
M
Tsukada
T
T
Kita
M
M
Negi
A
A
Honda
Y
Y
D000818:Animals; D004596:Electroretinography; D008028:Light Coagulation; D010857:Pigment Epithelium of Eye / Q000503:physiopathology; D011817:Rabbits; D012160:Retina / Q000503:physiopathology* / Q000601:surgery; D013997:Time Factors