Abstract
The author mentions eclipse-blindness, erythropsia, snowblindess, conjunctivitis vernalis, retinal diseases among aviators, and cataract (?) as disturbance of eye by sunlight. He also exemplifies electric ophthalmia and glassworker's cataract etc. as one occurring by irritation of artificial light. Then as to the problem what ray acts harmful against eye, the author lays more stress upon the qualities of ray than upon the quantities. He states that light within a certain limit of wave-length excites electically a certain part of eye-tissues and besides known facts described in the old literatures, he introduces an experiment worked by Dr. Shimizu performed under the author's direction that the light within 360-310μ.μ. wave-length disturbs readily the retina of rabbit's eye.
The author finally discusses on the protection of eye against these eyediseases and also explains bingability of variou3 kinds of glasses of shortwave ray.
