The Ophthalmoscope And How to Use It With Colored Illustrations Descriptions
The book The Ophthalmoscope And How to Use It With Colored Illustrations Descriptions was written by author James Thorington Here you can read free online of The Ophthalmoscope And How to Use It With Colored Illustrations Descriptions book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Ophthalmoscope And How to Use It With Colored Illustrations Descriptions a good or bad book?
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The iris pigment is of two kinds, one the pigment in the iris stroma, and the other, the retinal pigment layer. The color of the iris is controlled in great part by the amount of its pigment. The pigment in the retinal layer is always quite abundant, whereas that in the stroma varies considerably. If the stroma does not contain any pigment or only a small amount, then the retinal pigment layer shows through the stroma, giving the iris a blue color. The gray iris is seen when the stroma, free fr...om pigment, is quite thick. The dark iris (brown, hazel, etc. ) means that the stroma contains pig- ment. Blondes usually have light-colored irises and mulattoes or brunettes dark-colored irises, show- ing that usually the pigmentation of the iris is consistent with the eye ground and body pigmen- tation. Arteries. The long posterior ciliary and the anterior ciliary, and branches of the muscular arteries supply the iris with blood, forming a large circle at the periphery of the iris and a small circle near the pupillary margin.
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