By American Academy of Ophthalmology, James C. Bobrow MD
Stories the anatomy, body structure, embryology and pathology of the lens. Covers the epidemiology, review and administration of cataracts and offers an summary of lens and cataract surgical procedure, together with distinctive occasions. 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 final touch of part eleven, readers might be capable to:
Identify congenital anomalies of the lens
List varieties of congenital and purchased cataracts
Describe the organization of cataracts with getting older, trauma, medicines, and systemic and ocular diseases
Describe the evaluate 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
It is estimated that inheritance accounts for more than 50% of the risk of cortical cataracts. Recent studies identified mutations in the gene associated with congenital and age-related cortical cataracts, EPHA2, which has been mapped to lp36. This is the first gene known to cause hereditary, nonsyndromic age-related cortical cataracts, although mutations at this locus account for only a small fraction of cortical opacities. Similarly, 35%-50% of the risk of nuclear cataracts can be traced to inheritance.
The amplitude of accommodation is the amount of change in the eye's refractive power that is produced by accommodation. It diminishes with age and may be affected Table 2-1 Changes With Accommodation Ciliary muscle action Ciliary ring diameter Zonular tension Lens shape Lens equatorial diameter Axial lens thickness Central anterior lens capsule curvature Central posterior lens capsule curvature Lens dioptric power With Accommodation Without Accommodation Contraction Decreases Decreases More spherical Decreases Increases Steepens Minimal change Increases Relaxation Increases Increases Flatter Increases Decreases Flattens Minimal change Decreases 20 • Lens and Cataract • by some medications and diseases.
Ectopia Lentis et Pupillae In the autosomal recessive disorder ectopia lentis et pupillae, the lens and the pupil are displaced in opposite directions. The pupil is irregular, usually slit shaped, and displaced from the normal position. The dislocated lens may bisect the pupil or may be completely luxated from the pupillary space. This disorder is usually bilateral but not symmetric. Characteristically, the iris dilates poorly. Associated ocular anomalies include severe axial myopia, retinal detachment, enlarged corneal diameter, cataract, and abnormal iris transillumination.