The Ophthalmic Year Book Volume 2
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1905 edition. Excerpt: ...of cases in which the lens is replaced bysome product of a pathologic process. Toufesco concludes that exceptionally absence of the crystalline may be a fault of embryonal development, usually affecting the whole anterior segment of the globe. But in most cases, congenital aphakia results from a process of degeneration and absorption of the previously formed lens. The process occurs in fetal life, but is truly pathologic. It is really an example of what is seen near the other extremity of life in the spontaneous cure of cataract, of which instances were last year reported by Tacke and Augieras. TRAUMATIC POSTERIOR POLAR OATARACT.--Tl161' is.a striking tendency for traumatic cataract to begin or appear most marked at the posterior pole, and thence to cxtend into other parts of the lens. This led Fuchs to suppose a systcm of lymph channels in the lens, which Leber showed have no existence. Zur Xedden, reporting three cases of this form of cataract, thinks that if the lens is nourished wholly by osmosis, we must suppose that the osmotic currents take the direction that Fuchs assumed for the lymph channels. Zur Nedden points out that this form of cataract arises after injuries that do not'involve the posterior capsule, or even any penetration of the lens or of the eye-ball. He thinks a slight dislocation of the lens within the capsule disturbing the epithelial lining about the posterior pole, may allow fiuid to enter the lens from the vitreous, and spread in the figure of the star which is so noticeable a characteristic of posterior polar cataract. E. Weiss reports a case due to penetrating wound of the cornea; which involved the margin of the iris, but left no perceptible injury of _the anterior capsule of the lens. Adjoining the posterior...
- 189 x 246 x 6mm | 213g
- 13 Sep 2013
- United States
- black & white illustrations