By James C. Bobrow, MD

This part underwent significant revision for the 2008-2009 version. part eleven studies the anatomy, body structure, embryology, and pathology of the lens. It additionally covers the epidemiology of cataracts and their assessment and administration in adults. furthermore, an summary of lens and cataract surgical procedure is supplied, problems of cataract surgical procedure are mentioned, and cataract surgical procedure in precise events is explored. includes many new photographs.

Show description

Read Online or Download 2008-2009 Basic and Clinical Science Course: Section 11: Lens and Cataract (Basic and Clinical Science Course 2008-2009) PDF

Similar ophthalmology books


This state of the art reference covers each point of ophthalmology, combining the newest on genetics, diagnostic assistance and methods, confirmed administration thoughts, surgical techniques, new medicines, and extra. An esteemed writer group and contributions of enormous quantities of top-tier practitioners offer reliable information on virtually each ophthalmic and strategy.

Ophthalmology. A Short Textbook

The didactic notion of this e-book, grounded on years of training adventure, considers all features of educating: - it permits effortless learning via transparent but entire assurance, - effortless memorizing through a well-structured presentation, and - effortless software via a transparent contrast among indicators and prognosis, tabular presentation of significant indicators, and large indexing.

Experimental Approaches to Diabetic Retinopathy (Frontiers in Diabetes Vol 20)

This quantity units the degree for medical specialists operating with diabetic sufferers in addition to for researchers by means of describing the medical displays of retinopathy and their anatomical and sensible correlates. It stories at the moment on hand experimental versions in animals. The effect of retinal pericytes, neuroglia and, particularly, Mueller cells are mentioned intimately.

Advanced Glaucoma Surgery

This article offers professional guideline at the ideas at the moment hired for the surgical procedure of glaucomatous affliction, protecting either the host of novel microinvasive units for remedy of milder phases and the subtle suggestions that increase luck charges in sufferers with complex affliction. The serious steps in every one process are basically defined simply by many fine quality illustrations and surgical video clips.

Extra info for 2008-2009 Basic and Clinical Science Course: Section 11: Lens and Cataract (Basic and Clinical Science Course 2008-2009)

Sample text

In support of this theory, an anteroposterior gradient was found for both ions: potassium was concentrated in the anterior lens; sodium, in the posterior lens. Conditions such as refrigeration that inactivate the energy-dependent enzyme pumps also abolish these gradients. Most of the Na+,K+-ATPase activity is found in the lens epithelium and the superficial cortical fiber cells. The active transport mechanisms are lost if the capsule and attached epithelium are removed from the lens but not if the capsule alone is removed by enzymatic degradation with collagenase.

The wedge-shaped opacities may spread to adjacent fiber cells and along the length of affected fibers, causing the degree of opacity to increase and extend toward the visual axis. When the entire cortex from the capsule to the nucleus becomes white and opaque, the cataract is said to be mature (Fig 5-5). In mature opacities, the lens takes up water, swelling to become an intumescent cortical cataract. A hypermature cataract occurs when degenerated cortical material leaks through the lens capsule, leaving the capsule wrinkled and shrunken (Fig 5-6).

The ciliary muscle is a ring that, upon contraction, has the opposite effect from that intuitively expected of a sphincter. When a sphincter muscle contracts, it usually tightens its grip. However, when the ciliary muscle contracts, the diameter of the muscle ring is reduced, thereby relaxing the tension on the zonular fibers and allowing the lens to become more spherical. Thus, when the ciliary muscle contracts, the axial thickness of the lens increases, its diameter decreases, and its dioptric power increases, producing accommodation.

Download PDF sample

Rated 4.89 of 5 – based on 15 votes