548 



WERNER K. NOELL 



.000 



.001 



Fig. 4. Normal ERG from dark-adapted rabbits. The number beside the tracings 

 denotes stimukis intensity in arbitrary units. The flash of Hght triggers the cathode ray 

 sweep. V'ertical lines denotes 100 /mv and refer to the amplification of the correspond- 

 ing rows. Each dash of the time marking represents 10 msec. A stimulus intensity 

 corresponding to that of .01 was used for eliciting the ERG during x-irradiation. 



I min. 



l7'/2' 



dJ 



-u- 



21' 



^— 1-- '^^t ^'ir~-^^,-^y 



Fig. 5. Examples of the ERG during 2,000 kvp irradiation, c, ERG of close eye; 

 d, ERG distant eye. Irradiation begins at zero time. The horizontal line denotes 

 2 sec; the vertical, 100 fiv. 



