I. Observations of rabbits bred under the strong illumination-more than 1000 lx-for 2 weeks, 1 month, and two months severally.
II. Applied the 6500°K fluorescent lamp, the 3500°K one, or the glass-walled, low-tension mercury lamp to the cornea of the human eye, at a distance of 2 or 3 cm, for 2 hours. Under every conditions, none of them gave injury.
III. Sticking to the nasal root the ultra-violet ray of the ordinary fluorescent lamp in the same 310-400 mμ wave-length as the standard one, and which puts forth about 25 times as much energy applied for 2 hours or 5 hours, neither the injury causel by the ultra-violet-ray was found out at all, nor did the skin giveris to the erythema.
By the experiments above-stated and through my clinical experience since 1948 regarding the fluorescent lamp, I made a conclusion as follows;-within the limits of the wave length and the guantity issued from the ultra-violet-ray of the fluorescent lamp, it never injures the eye of the human being.
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