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, evaluate and administration of cataracts and provides an outline of lens and cataract surgical procedure, together with certain events. part eleven additionally walks the reader via making a suitable differential prognosis and designing a administration plan for intraoperative and postoperative issues of cataract surgery.

Upon final touch of part eleven, readers could be capable to:

Identify congenital anomalies of the lens
List different types of congenital and purchased cataracts
Describe the organization of cataracts with getting older, trauma, medicinal drugs, and systemic and ocular diseases
Describe the overview and administration of sufferers with cataract and different lens abnormalities

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Additional info for 2014-2015 Basic and Clinical Science Course (BCSC): Section 11: Lens and Cataract

Example text

Eyes with congenital nuclear cataracts tend to be microphthalmic, and they are at increased risk of developing aphakic glaucoma. Capsular Capsular cataracts are small opacifications of the lens epithelium and anterior lens capsule that spare the cortex. They are differentiated from anterior polar cataracts by their Figure 3-11 Sutural cataract. ,.. 34 • Lens and Cataract • Figure 3-12 A cerulean cataract consists of small bluish opacities in the cortex. (Courtesy of Karla J. Johns. ) Figure 3-13 Congenital nuclear cataract.

Sometimes a Mittendorf dot is associated with a fibrous tail or remnant of the hyaloid artery projecting into the vitreous body. Epicapsular Star Another very common remnant of the tunica vasculosa lentis is an epicapsular star (Fig 3-6). As its name suggests, this anomaly is a star-shaped distribution of tiny brown or golden flecks on the central anterior lens capsule. It may be unilateral or bilateral. Peters Anomaly Peters anomaly is part of a spectrum of disorders known as anterior segment dysgenesis syndrome, also referred to as neurocristopathy or mesodermal dysgenesis.

Thus, when the ciliary muscle contracts, the axial thickness of the lens increases, the diameter of the lens decreases, and the dioptric power of the eye increases, producing accommodation. When the ciliary muscle relaxes, the zonular tension increases, the lens flattens, and the dioptric power of the eye decreases (Table 2-1). The accommodative response may be stimulated by the known or apparent size and distance of an object or by blur, chromatic aberration, o~· a continual oscillation of ciliary tone.

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