By James C. Bobrow MD
Studies the anatomy, body structure, embryology and pathology of the lens. Covers the epidemiology, assessment and administration of cataracts; offers an outline of lens and cataract surgical procedure; and explores the problems and specified 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)
Congen ital and infantile catarac ts may be un ilateral or bilateral. They can be classified by morphology, presumed or defined genetic etiology, presence of specific metabolic disorders, or associated ocular ano malies or systemic findings (Table 4-1). In general, approximately one-third of congen ital o r infantile ca taracts are a component of a more extensive syndrome or disease (eg, cataract resultin g from congenital rubella syndrome), one-third occur as an isolated inherited trait, and one-third res ult from und etermined causes.
A luxated, or dislocated, lens is completely displaced from the pupil, implying separation of all zonular attachments. Findings associated with lens subluxation include decreased vision, marked astigmatism, monocular diplopia, and iridodonesis (tremulous iris). Potential complications of ectopia lentis include cataract and displacement of the lens into the anterior chamber or into the vitreous. Dislocation into the ante rior chamber or pupil may cause pupillary block and angle-closure glaucoma.
Anterior polar cataracts are sometimes seen in association with other ocular abnormalities, including microphthalmos, persistent pupillary membrane, and anterior lenticonus. They do not require treatment but often cause anisometropia. JCHNACRAIC-'AO @ CJBA I Figure 4·9 A, Lame ll ar cataract. B, Lamella r cata ract viewed by retroillumination. C, Schemat ic of lamellar cataract. (Courtesy of ClBA Pharmaceutical Co. , division of CIBA-GEIGY Corp. Reproduced with permission from Cl inical Symposia.
2011-2012 Basic and Clinical Science Course, Section 11: Lens and Cataract (Basic & Clinical Science Course) by James C. Bobrow MD