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It has long been established that the short wave radiations of the spectrum, particularly the ultraviolet rays, have a deleterious effect on the anterior segment of the eye. Protection by means of screens and glasses is sufficient in most cases, but moving picture actors, by the very nature of their calling, are denied this relief. The author undertook to discover a method to protect these people by some means that would remain invisible.
After a series of experiments on rabbits, he discovered that ethyl diphenylmaleate absorbs ultraviolet rays up to 3,000 angstrom units. When dissolved in castor oil in the proportion of 2.9 per cent and instilled into the eye at intervals of ten minutes, it is well tolerated and renders perfect protection.