Observations with the slit-lamp covering a period of almost ten years have led me to certain views on the types and frequency of opacities of the lens in persons beyond middle life.
I shall first discuss briefly the anatomy and growth of the lens. The lamellar structure of the lens from within outward, as seen in the beam of the slit-lamp, is as follows : The innermost unit—the embryonic nucleus—presents on its anterior surface the vertical, and on its posterior surface the inverted, Y suture. It shows a clearer, therefore presumably less dense, central interval. Surrounding this structure one next sees the surfaces of the external embryonic nucleus presenting a somewhat more complex suture design. These two nuclear entities approximately constitute all of the lens as it is at birth.
Under the anterior capsule of the lens is the layer of epithelial cells. At the equator of the lens they
VON DER HEYDT R. LENS CHANGES AFTER MIDDLE AGE. Arch Ophthalmol. 1930;4(2):188–193. doi:https://doi.org/10.1001/archopht.1930.00810100034004
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