By James J. Reidy MD
Discusses the constitution and serve as of the cornea and exterior eye and experiences proper exam innovations. Covers infectious and ocular floor ailments, problems and surgical procedure of the ocular floor, immune-mediated and neoplastic issues, congenital anomalies and degenerations. A lately up to date bankruptcy at the genetics of corneal dystrophies displays the recent IC3D type. Discusses poisonous and nerve-racking accidents and corneal transplantation. comprises many new colour photos. lately revised 2010 2011.
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Extra resources for 2011-2012 Basic and Clinical Science Course, Section 8: External Disease and Cornea (Basic & Clinical Science Course)
Human inlmu nodeficiency virus (HI V), hepa ti tis B virus, hepatitis C vi rus, rabies virus, and the agent of ereutzfe ldt-Jakob disease are not immediately obvious without systemic clues or laboratory testing. Every patient must be approached as potentially contagious. Guidelines for ro utine ophthalmic examinations include the following: Wash hands between patient examinations. Use d isposable gloves if an open sore, blood, or blood -contaminated fl uid is present. Using cotton -tipped applicators to manipulate the eyelids can also minimi ze direct contact.
In addition, retinoscopy can disclose disrupted light reflexes caused by disturbances of the corneal surface. In cases where reti noscopic findings exceed the corresponding slit-lamp findings, retinoscopy can help gauge the relative effect of corneal surface changes on vision. See also BCSC Section 3, Clinical Optics. Krachmer JH, Mannis MJ. Refraction of the abnormal cornea. Tn: Krachmer JH, Mannis MJ, Holland EJ, eds. Cornea. 2nd ed. Vol l. Mosby; 2005:167-170. Prevention Practices in Ophthalmology Some corneal and external eye diseases can be prevented.
The handheld esthesiometer (Coche-Bonnet) is a contact device that gives quantitative information about corneal sensation. This device contains a thin, flexible, retractable nylon filament. The patient's cornea is touched with the filament, which is extended to the full length of 6 cm. S-cm steps until it becomes rigid enough to allow the patient to feel its contact. This length is then recorded. EstheSiometry readings may vary with user technique, but in general a lower number, or shorter filament, indicates reduced corneal sensation.