By James C. Bobrow MD
Experiences the anatomy, body structure, embryology and pathology of the lens. Covers the epidemiology, overview and administration of cataracts; offers an outline of lens and cataract surgical procedure; and explores the issues and exact events of cataract surgical procedure. final significant revision 2008 2009.
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Additional info for 2011-2012 Basic and Clinical Science Course, Section 11: Lens and Cataract (Basic & Clinical Science Course)
32 • Lens and Cataract Figure 4-6 Epicapsular star. Peters Anomaly Peters anomaly, historically called posterior corneal defect, is part of a spectrum of disorders known as anterior segment dysgenesis syndro me, also known as neurocristopathy or mesodermal dysgenesis. Peters anomaly is characterized by a central or paracentral corneal opacity (leukoma) associated with the thinni ng or absence of adjacent endothelium and Descemet's membrane. In normal ocular development, the lens vesicle separates from the surface ectoderm (t he future corneal epithelium) at about 33 days' gestation.
Lens vesicle formation (30 days) D. Lens vesicle completed (33 days) Figure 4·' Embryologic development of the lens. See text for detailed description of artwork. ) gestation , the lumen of the lens vesicle is obliterated. The elongated cells are called the primary lens f ibers. As the fiber cells mature, their nuclei and other membrane-bound organelles undergo degradation, a process that reduces light scattering. The primary lens fibers make up the embryonic nucleus that will ultimately occupy the central area of the lens in adu lt life.
Vol 3. 16. Lambert S. Lens. In: Taylor D, ed. Paediatric Ophthalmology. 2nd ed. Boston: Blackwell Science; 199H45-476. Shortt AJ, Lanigan B, O'Keefe M. Pars pla na lensectomy for the manageme nt of ectopia lent is in chi ld ren. J Pediatr Ophthalmol Strabismus. 2004;41 (5):289-294. Streeten BW. Pathology of the lens. In: Albert DM, Jakobiec FA, eds. Principles and Practice of Ophthalmology. 2nd ed. Philadelphia, Saunders; 2000,chap 4. PP 3685-3749. CHAPTER 5 Pathology Aging Changes As the lens ages, it increases in we ight and thickness and decreases in accommodat ive power.