This presentation describes the unique anatomy and physiology of the vascular beds that serve the eye. The needs for an unobstructed light path from the cornea to the retina and a relatively fixed corneal curvature and distance between refractive structures pose significant challenges for the vasculature to provide nutrients and remove metabolic waste. To meet these needs, the ocular vascular beds are confined to the periphery of the posterior two thirds of the eye and a surrogate circulation provides a continuous flow of aqueous humor to nourish the avascular cornea, lens and vitreous compartment. The production of aqueous humor (and its ease of egress from the eye) also generates the intraocular pressure (IOP), which maintains the shape of the eye. However, the IOP also exerts a compressing force on the ocular blood vessels that is higher than elsewhere in the body. This is particularly true for the intraocular veins, which must have a pressure higher than IOP to remain patent, and so the IOP is the effective venous pressure for the intraocular vascular beds. Consequently, the ocular circulation operates at a lower perfusion pressure gradient than elsewhere in the body and is more at risk for ischemic damage when faced with low arterial pressure, particularly if IOP is elevated. This risk and the specialized tissues of the eye give rise to the fascinating physiology of the ocular circulations.

This dictionary gives the intriguing origins of hundreds of everyday words and expressions. Useful for reference and fun just for browsing, Dictionary of Word Origins is also a great way to expand vocabulary and enjoy doing it.

This book covers sports-related eye injuries, presenting standard processes to enable clinical practitioners to make appropriate decisions on the management of these patients. Sports-related activities are responsible for a large percentage of ocular injuries, particularly among young people, and can even lead to blindness. Given the increasing trend in these injuries and the potential functional loss they entail, it is important to understand how to prevent and to accurately diagnose and treat them. This book discusses the definition, etiology, clinical presentations and signs, treatment, and prevention of sports-related eye injuries, and includes typical clinical cases, together with a wealth of images and illustrative figures. Offering a systematic and symptom-based guide to clinical practice, it will help clinical practitioners to fully prepare for the various challenges posed by sports-related eye injuries.

In Edgar Allan Poe's "The Tell-Tale Heart", the narrator tries to prove his sanity after murdering an elderly man because of his "vulture eye". His growing guilt leads him to hear the old man's heart beating under the floorboards, which drives him to confess the crime to the police.

Kanski’s Clinical Ophthalmology: A Systematic Approach is the classic specialty text providing the perfect ophthalmology foundation for trainees through to experienced practitioners. The famous visually dynamic and succinct format enables easy comprehension and focused guidance in the diagnosis and management of ophthalmic disorders. Build the ultimate foundation in ophthalmology with this market-leading resource. Benefit from guidance on examination, imaging, and the recognition of systemic conditions associated with ocular disease. Completely revised by award-winning ophthalmic educator Brad Bowling, the eighth edition reflects the latest advances, making this an indispensable resource to enhance learning, aid exam preparation and guide clinical practice. Designed for rapid reference and efficient recall, the concise but comprehensive chapters use crisp targeted text, bulleted lists, tables, and visual aids to highlight salient points across all ophthalmology subspecialties. Features detailed updates on key evolving topics such as the spectrum of macular disease, with many new disorders added to this edition across a range of subspecialties. Increased emphasis on practical investigation and management. Includes 2,600 illustrations, images and artworks, with over 900 brand new for this edition, including ultra wide-field imaging, fundus autofluorescence, and high-resolution OCT. Consult this title on your favourite e-reader.