The American encyclopedia and dictionary of ophthalmology Edited by Casey AWood, assisted by a large staff of collaborators . Central Portion of Anterior and Posterior Lens Stars Showing Lines of Union of Sectors. (Babuehin.) and elastic, though brittle. When cut through it tears irregularly,and the incised edges curl up in a roll with the inner surface out-ward. The minimum thickness of the capsule is at the posteriorpole. Each surface shows a zone of maximum thickness occupying aposition concentric with the equator toward the periphery of thelens. The lens substance is formed by the invagina
The American encyclopedia and dictionary of ophthalmology Edited by Casey AWood, assisted by a large staff of collaborators . Central Portion of Anterior and Posterior Lens Stars Showing Lines of Union of Sectors. (Babuehin.) and elastic, though brittle. When cut through it tears irregularly,and the incised edges curl up in a roll with the inner surface out-ward. The minimum thickness of the capsule is at the posteriorpole. Each surface shows a zone of maximum thickness occupying aposition concentric with the equator toward the periphery of thelens. The lens substance is formed by the invagination of the ectoderm,and is, consequently, an epithelial structure—the capsule being de-rived from the mesoderm. For this reason the lens grows (by con-version of the marginal cells of the anterior capsule into younglenticular fibres) larger, heavier, thicker, and harder, as age ad-vances. Lens substance in process of formation can be found at allages of life. The hardening process begins in childhood, and affects chiefly thecentral portions, so that in the adult a distinct condensation of thetissues occurs, and a nuc
Size: 1624px × 1538px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectophthalmology, bookye
