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LEO HESS, M.D.

Arch Ophthal. 1943;30(1):93-104.

	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 color of the iris is known to be dependent on two pigments, one within the two epithelial layers of the posterior part of the iris (pars iridica retinae) and the other within the cells of the stroma. When only the first pigment is present, the iris appears to be blue. In gray, brown and black eyes the second pigment also is present. As to black eyes, it should be kept in mind that at the age of puberty the iris becomes slightly lighter, in contrast to the darkening of the skin and of the hair. Dark brown eyes are rare in adults of the white race. The origin of the pigment of the iris is not clearly understood. It is likely that in man, as in Amphibia, certain substances are produced in the body at a certain time of embryonic life and are carried by the blood stream into . . . [Full Text PDF of this Article]

Author Affiliations
BOSTON

Footnotes
Dr. C. Stanley Raymond, superintendent of the Wrentham State School, permitted collection at that school of some of the observations presented.

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