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WILLIAM A. MANN, Jr., M.D.

Arch Ophthal. 1935;13(6):985-991.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

The solar spectrum is divided by physicists into a visible spectrum and ultraviolet and infra-red rays. The wavelength of the rays in the visible spectrum ranges between approximately 400 and 700 millionths of a millimeter, the red rays having the longest wavelength and the orange rays the next longest ; then follow the yellow, green and blue rays until the violet rays are reached at the opposite end of the spectrum from the red rays. Rays with too short a wavelength to appear in the visible spectrum follow the violet rays and are called ultraviolet. Rays longer than the red rays have the quality of "heat rays"; they do not appear visible to the human eye and are known as infra-red rays.

In ordinary photography, as practiced for many years, only the visible spectrum is employed, the finished picture thus showing exactly what is seen by the human eye. One of . . . [Full Text PDF of this Article]

Author Affiliations
CHICAGO

From the Department of Ophthalmology, Northwestern University Medical School.

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