American Druggist and Pharmaceutical Record Volume 39 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1901 Excerpt: ...choroid, which invests the posterior five-sixths of the globe of the eye, and forms a lining for the inner surface of the sclerotic. This is the vascular and pigmentary coat of the eyehall--that is. it contains must of the blood vessels of the THE IKIS. The word iris means a rainbow, and it receives this name from its various colors in different individuals. It is this structure which gives to the eye its special color, and upon which a large part of its beauty depends. When we speak of a blue, black or brown eye we mean the color of the iris of that particular eye, and it is usually in accord with the general coloring of the individual; blondes usually having blue or gray eyes, and brunettes brown or black eyes. It is an interesting fact that the eyes of new-born babies are always blue, and they do not begin to assume their permanent color until the sixth or eighth week of life, being then formed by the addition of a greater or less amount of dark pigment. The eyes of albinos are pink, not from this color of the iris, but from the reflection seen through it of the red blood in the vessels of the choroid, in which membrane there is also a lack of pigment. The sight of such an eye is always deficient, and they are painfully sensitive to light, against an excess of which they have not the natural protection of a darkly pigmented choroid. The iris is a thin, circular-shaped, contractible membrane, suspended in the aqueous humor behind the cornea and in front of the lens. It is perforated slightly to the nasal side of its center by a circular aperture, the pupil, for the transmission of light, thus forming a curtain stretched across the interior of the eye. There is a popular notion that dark eyes are stronger than light ones; the only foundation for this idea ...