Download A Textbook of Clinical Ophthalmology: A Practical Guide to by Ronald Pitts Crick, Peng Tee Khaw PDF

By Ronald Pitts Crick, Peng Tee Khaw

The fabric during this textbook on medical ophthalmology has been revised and extended to incorporate advancements in study and perform. Containing 357 illustrations in the course of the textual content, it's a functional advisor to the research of ophthalmology, however it embraces the ocular features of normal ailments world-wide and easy equipment of research and remedy the place acceptable. the quantity positive factors references by means of web page and representation quantity, as a result of collaboration with the authors of "Colour Atlas of Ophthalmology"; the 2 books include all jointly an exceptional 579 illustrations (343 in colour), together with sixteen stereo plates. one other significant other e-book is "The Ophthalmology Examinations Review", which goals to supply a good presentation of information for exam reasons. jointly the 3 volumes provide a research foundation for ophthalmologists in education, whereas supplementing their studying of medical paintings and surgical method with the research of analysis papers and assessment monographs.

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Additional info for A Textbook of Clinical Ophthalmology: A Practical Guide to Disorders of the Eyes and Their Management

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Vein a lon0 Posterior ciliary artery / conjunctival >d'j£r vessels ^^JWf . v ^*sk s» / major arterial *V i §N»-^L circle in ciliary \^> \ / ' V " 1 / 2 ? f ^ b o d y supplying a short posterior V ^ S * - * ^ * * ^ central / , ' ''m:^, iris and ciliary ciliary artery y^^^tf^—r*I / '' %>' '" body supplying branches a ary . V'V' ana vein 1 1 / ' ' arterial circle of M ' ' minor arterial circle tne tic nerve near pupil margin head Fig. 9 Blood supply of the left eyeball viewed from above. Horizontal section at the level of the optic nerve.

These firm attachments are important because traction on the retina occurs at these points if the vitreous contracts, resulting in a retinal tear. The centre of the gel contains less collagen than the cortex and the collagen fibrils are condensed into tracts. These tracts run forward from the disc. There are three major tracts. The hyaloid tract inserts into the back of the lens. The other two major tracts insert into the ciliary body. One important attribute of these tracts is their ability to confine a vitreous haemorrhage between them rather than allowing the diffusion of haemorrhage throughout the whole gel.

The central lens fibres are called the nucleus and the more peripheral fibres the cortex. In embryonic life the foetal lens is initially seen as a thickening of the surface ectoderm overlying the optic vesicle. This ectodermal thickening forms the lens vesicle, from which the lens is developed. The constant laying down of lens fibres causes the lens size to increase gradually. The anatomy of the lens can only be understood by reference to its curious development (p46, Figs. 8 pp 44 - 47 ). The lens is an avascular structure depending for its nutrition on diffusion from the aqueous and vitreous into which the metabolic products of the lens diffuse in the opposite direction.

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