The Precise Evaluation of Light Therapy in Experimental Rickets

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Abstract
A study of the anti-rachitic effect of various portions of the u.-v. spectrum on rachitic albino rats, using filters, indicates that the therapeutic zone may not be confined to the commonly accepted "vital band" in the region of 3000 A, but that when various groups of lines are used adjusting total intensities for each group to a common level, it may be possible to show that other parts of the spectrum have a contributory effect. Tentative findings indicate that a curative dose of the whole arc radiation (exclusive of infra red), when followed by a certain amount of infra red radiation, protects about 1/3 of the cases; when infra red precedes therapeutic u.-v., the protection is increased to 2/3 of that obtained from therapeutic u.-v. alone, thus confirming and amplifying the results of Hess and of Clausen. The work is being extended with a mono-chromator.

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