By James J. Reidy MD
Discusses the constitution and serve as of the cornea and exterior eye and reports proper exam ideas. Covers infectious and ocular floor illnesses, issues 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 category. Discusses poisonous and aggravating accidents and corneal transplantation. comprises many new colour pictures. lately revised 2010 2011.
Read or Download 2011-2012 Basic and Clinical Science Course, Section 8: External Disease and Cornea (Basic & Clinical Science Course) PDF
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Extra info for 2011-2012 Basic and Clinical Science Course, Section 8: External Disease and Cornea (Basic & Clinical Science Course)
Mos t instruments have a pachometer attached to the fo cusing apparatus so that corn eal thickness can be measured. Both contact and non contact specular microscopes may include a computer for analyzin g th e images. The following parameters can be calculated from a specular or confocal image. ) Density. The normal endothelial cell density dec reases with age. Endothelial cell density normally exceeds 3500 cells/m m' in childre n and graduall y declines with age to about 2000 cells/mm' in older people.
Typically, the cent ral cornea is about 3 D steeper than the periphery, a positive shape factor. Clini ca ll y, the cornea is di vided into zones that surround ftxation and blend into one another. CHAPTER 2: Exami natio n Techn iques for the External Eye and Cornea . 37 The central zone of 1- 2 mm closely fits a spheri cal surface. Adjacent to the central zone is a 3- 4-mm doughnut with an outer diameter of 7-8 mm. Called the paracentral zone, th is doughnut represents an area of progress ive flatten ing from the center.
Interpretation of Ocular Cytology Microscopic examination of material collected from the ocular surface can reveal ceils, cell ular elements, and microorganisms that can be helpful in diagnostic evaluation; such examination is perhaps best carried out in conjunction with a laboratory experienced in these evaluations. Dry-Eye Syndrome The term dry-eye syndrome has been defined as "a multifactorial disease of the tears and ocular surface that results in symptoms of d iscomfort, visual disturbance, and tear-ftlm instability with potential damage to the ocular surface.