Abstract
The characteristics of the localization of fluorescein in the iris, ciliary body and retina were studied in the monkey eye by the whole mount preparation and paraffin section methods. By incident light fluorescence microscopy and transparent fluorescence microscopy the penetration of free fluorescein into the outer retinal layer as well as into of the nonpigmented epithelium of the ciliary body is noted. The site of the permeability barrier for protein-bound fluorescein is postulated in the pigment epithelium and the ciliary epithelium. From the anatomical and embryological points of view, the two kinds of epithelium may have the same tendency as to the permeability of fluorescein.
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