EFFECTS OF RADIANT ENERGY ON THE EYE. 7^3 



the eye could be produced by ultra violet light, any light containing 

 these rays could not be considered ideal light. The positive findings, 

 previously mentioned of pathological changes due to ultra violet light, 

 violet and perhaps blue rays, such as the glass blower's cataract, 

 erythropsia, blindness permanent and temporary, and scotomata as 

 well as other functional retinal disturbances, they held to be against 

 the assumption that light containing considerable amounts of ultra 

 violet, violet and blue rays, can be considered ideal and harmless. 

 Further minor objections were made to the exposure time used in 

 photographing the different light sources and it was pointed out that 

 their newer glasses "Euphosglas A" and "Euphosglas B," more 

 suitable for technical purposes, had not been examined. 



