By James C. Bobrow, MD
This part underwent significant revision for the 2008-2009 version. part eleven studies the anatomy, body structure, embryology, and pathology of the lens. It additionally covers the epidemiology of cataracts and their review and administration in adults. additionally, an outline of lens and cataract surgical procedure is supplied, issues of cataract surgical procedure are mentioned, and cataract surgical procedure in precise events is explored. includes many new photos.
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Extra resources for 2008-2009 Basic and Clinical Science Course: Section 11: Lens and Cataract (Basic and Clinical Science Course 2008-2009)
In mature opacities, the lens takes up water, swelling to become an intumescent cortical cataract. A hypermature cataract occurs when degenerated cortical material leaks through the lens capsule, leaving the capsule wrinkled and shrunken (Fig 5-6). A morgagnian cataract occurs when further liquefaction of the cortex allows free movement of the nucleus within the capsular bag (Fig 5-7). Histopathologically, cortical cataracts are characterized by local swelling and disruption of the lens fiber cells.
In other eyes, remnants of the pupillary membrane are often visible as pupillary strands. Zonules of Zinn Experimental evidence suggests that the zonular fibers are secreted by the ciliary epithelium, although how these fibers insert into the lens capsule is not known. The zonular fibers begin to develop at the end of the third month of gestation. Hyaloid Figure 4-3 Components of the tunica vasculosa lentis. artery (Illustration bV Christine Gralapp) 30 . Lens and Cataract Duke-Elder S, ed. System of Ophthalmology.
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 syndrome, also known as neurocristopathy or mesodermal dysgenesis. Peters anomaly is characterized by a central or paracentral corneal opacity (leukoma) associated with the thinning or absence of adjacent endothelium and Oescemet's membrane. In normal ocular development, the lens vesicle separates from the surface ectoderm (the future corneal epithelium) at about 33 days' gestation.
2008-2009 Basic and Clinical Science Course: Section 11: Lens and Cataract (Basic and Clinical Science Course 2008-2009) by James C. Bobrow, MD