By American Academy of Ophthalmology, James C. Bobrow MD
Experiences the anatomy, body structure, embryology and pathology of the lens. Covers the epidemiology, evaluate and administration of cataracts and provides an summary of lens and cataract surgical procedure, together with particular events. part eleven additionally walks the reader via making a suitable differential analysis and designing a administration plan for intraoperative and postoperative issues of cataract surgery.
Upon finishing touch of part eleven, readers may be capable to:
Identify congenital anomalies of the lens
List forms of congenital and purchased cataracts
Describe the organization of cataracts with getting older, trauma, drugs, and systemic and ocular diseases
Describe the review and administration of sufferers with cataract and different lens abnormalities
Read Online or Download 2014-2015 Basic and Clinical Science Course (BCSC): Section 11: Lens and Cataract PDF
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Additional resources for 2014-2015 Basic and Clinical Science Course (BCSC): Section 11: Lens and Cataract
The central, or oldest, lens Corneal section Anterior capsule Infantile nucleus Slit-lamp beam Y-sutures in embryonic nucleus Posterior capsule Slit-lamp beam on iris Figure 3-2 Y-shaped sutures, formed during embryogenesis, are visible within the adult lens with the use of the slit lamp. J F • CHAPTER 3: Embryology and Developmental Defects • 25 . fibers gradually become less malleable, and the lens nucleus becomes more rigid. This process progressively reduces the amplitude of accommodation. Tunica Vasculosa Lentis At about 1 month of gestation, the hyaloid artery, which enters the eye at the optic disc, branches to form a network of capillaries, the tunica vasculosa lentis, on the posterior surface of the lens capsule (Fig 3-3).
At the same time that the lens vesicle is forming, the optic vesicle is invaginating to form the 2-layered optic cup. 21 I 22 • Lens and Cataract • Surface ectoderm A. l Optic vesicle formation (25 days) Forming lens vesicle B. Lens placode formation (27-29 days) C. Figure 3-1 Lens vesicle formation (30 days) D. Lens vesicle completed (33 days) Embryologic development of the lens. See text for detailed description of artwork. ) Primary Lens Fibers and the Embryonic Nucleus The cells in the posterior layer of the lens vesicle stop dividing and begin to elongate.
Developmental Defects Ectopia Lentis Ectopia lentis is a displacement of the lens that may be congenital, developmental, or acquired. A subluxated lens is partially displaced from its normal position but remains in the pupillary area. 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 36 • Lens and Cataract • displacement of the lens into the anterior chamber or into the vitreous.