Download e-book for iPad: 2014-2015 Basic and Clinical Science Course (BCSC): Section by American Academy of Ophthalmology, James C. Bobrow MD
By American Academy of Ophthalmology, James C. Bobrow MD
Stories the anatomy, body structure, embryology and pathology of the lens. Covers the epidemiology, assessment and administration of cataracts and provides an summary of lens and cataract surgical procedure, together with certain 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 of completion 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, drugs, and systemic and ocular diseases
Describe the evaluate and administration of sufferers with cataract and different lens abnormalities
Read or Download 2014-2015 Basic and Clinical Science Course (BCSC): Section 11: Lens and Cataract PDF
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Extra info for 2014-2015 Basic and Clinical Science Course (BCSC): Section 11: Lens and Cataract
Drugs that relax the ciliary muscle are called cycloplegics. 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.
Rubella Maternal infection with the rubella virus, an RNA togavirus, can cause fetal damage, especially if the infection occurs during the first trimester of pregnancy. Systemic manifestations of congenital rubella infection include cardiac defects, deafness, and mental disability. Cataracts resulting from congenital rubella syndrome are characterized by pearly white nuclear opacifications. Sometimes the entire lens is opacified (complete cataract), and the cortex may liquefy. Histologically, lens-fiber nuclei are retained deep within the lens substance.
Live virus particles may be recovered from the lens as late as 3 years after the patient's birth. Cataract removal may be complicated by excessive postoperative inflammation caused by release of these live virus particles. ) Other ocular manifestations of congenital rubella syndrome include diffuse pigmentary retinopathy, microphthalmos, glaucoma, and transient or permanent corneal clouding. Although congenital rubella syndrome may cause cataract or glaucoma, both conditions are usually not present simultaneously in the same eye.
2014-2015 Basic and Clinical Science Course (BCSC): Section 11: Lens and Cataract by American Academy of Ophthalmology, James C. Bobrow MD