By James C. Bobrow MD
Experiences the anatomy, body structure, embryology and pathology of the lens. Covers the epidemiology, evaluate and administration of cataracts; offers an summary of lens and cataract surgical procedure; and explores the problems and detailed occasions of cataract surgical procedure. final significant revision 2008 2009.
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Extra info for 2011-2012 Basic and Clinical Science Course, Section 11: Lens and Cataract (Basic & Clinical Science Course)
Aniridia is almost always bilateral. Two-thi rds of cases are fam ilial, and one-th ird are sporad ic. Sporadic cases of aniridia are associated with a high incidence of Wilms tumor and the WAGR complex ( Wilms tumor, an iridia, gen itourinary malformations, and mental retardation). Anteri or and posterior polar lens opacities may be present at birth in patients with anir idia. Cortical, subcapsular, and la mellar opacities develop in 50%-85% of patients within the firs t 2 decades. The lens opacities may progress and furth er impair vision.
Illustration by John A. ) Figure 4-10 A, Anter ior polar cat aract. B, Ant erior polar cataract viewed by retroilluminat ion . CHAPTER 4: Embryology. 37 of the eye. Capsular fragility has been repo rted. Posterior polar cataracts are usually stable but occasionally progress. They may be familial or sporadic. Familial posterior polar cataracts are usually bilateral and inherited in an autoso mal dominant pattern. Sporadic posterior polar cataracts are often unilateral and may be associated with remnants of the tunica vasculosa lentis or with an abnormality of the posterior capsule such as lenticonus or lentiglobus.
LAMA. 2006;295(23)02752-2758. Schlienger RG, Haefeli WE, lick H, Meier CR. Risk of cataract in patients treated with statins. Arch Intern Med. 2001;161:2021-2026. Trauma Traumatic lens damage may be caused by mechanical injury and by physical forces (radiation, chemicals. electrical current). Contusion Vossius ring Blunt injury to the eye can sometimes ca use pigment from the pupillary ruff to be imprinted onto the anterior surface of th e lens in a Vossius ring. Although a Vossius ring is 54 • Lens and Cataract visually insignificant and gradually resolves with ti me.