New PDF release: Fundoscopy made easy

By Sujoy Ghosh; et al

ISBN-10: 0702042978

ISBN-13: 9780702042973

ISBN-10: 0702042986

ISBN-13: 9780702042980

ISBN-10: 0702049913

ISBN-13: 9780702049910

Fundoscopy Made effortless (Ie)

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Extra resources for Fundoscopy made easy

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The retinal capillary wall is lined by endothelial cells and pericytes which form a tight inner retinal barrier. The retinal blood vessels are autoregulated like those of the brain. Retinal veins The perivenular capillaries ultimately form the four main branches (superotemporal, inferotemporal, superonasal and inferonasal) before forming the central retinal vein at the optic disc. The vessels cross over one another in the retina. 5 mm, the optic disc lies about 3 mm nasal to the fovea. The edge of the optic disc may be slightly elevated.

Panretinal laser involves the application of 500 μm of Argon laser photocoagulation spots, each separated by an interval of a similar spot size to the mid-peripheral retina. A row of laser burns is initially placed approximately three disc diameters temporal to the fovea to avoid getting too close to the fovea. About 1500 burns are usually required (in two or three sessions). Severe cases may require further photocoagulation. The aim is to cover the ischaemic areas, and regression of new vessels occurs in almost 80% of cases.

26 The Normal Fundus and Its Variants 3 Albino fundus Melanocytes normally synthesise melanin in the retinal pigment ­epithelium. Absence of melanin due to any defect in its synthesis allows the choroidal vasculature to be seen under the retinal vessels. Ocular albinism is a rare X-linked disorder, affecting the eyes only. Oculocutaneous albinism is an autosomal recessive condition, characterised by hypopigmentation of skin, hair, fundus and irides. It is often associated with a decrease in visual acuity, photophobia and nystagmus.

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Fundoscopy made easy by Sujoy Ghosh; et al

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