New PDF release: 2011-2012 Basic and Clinical Science Course, Section 8:

By James J. Reidy MD

ISBN-10: 1615251154

ISBN-13: 9781615251155

Discusses the constitution and serve as of the cornea and exterior eye and experiences correct exam options. 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 hot IC3D type. Discusses poisonous and irritating accidents and corneal transplantation. comprises many new colour photos. lately revised 2010 2011.

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Additional resources for 2011-2012 Basic and Clinical Science Course, Section 8: External Disease and Cornea (Basic & Clinical Science Course)

Example text

Impression cytology Imp ression cytology is primarily a research tool, but it allows fo r precise assessment of the ocular surface epithelium. A piece of filter paper is pressed against a specific area of the 47 48 • Externa l Dis ease and Cornea conj unctival (or, in rare cases, the corneal) surface to lift off epithelial cells. This procedure can be considered a noninvasive superficial biopsy that provides a means for mapping specific cell changes topographicall y and quantifying surface abnormalities.

29 Scheim pflug image map depicting multip le points of corneal thi ckn ess measurement (in micrometers). (Courtesy of George J. } Corneal pachometry can help in diagnosing corneal thinning disorders and can also be used to assess the function of the corneal endothelium. lm. lm suggests a higher risk for symptomatic corneal edema after intraocular surgery. Optical coherence tomography (OCT) and high-resolution ultrasonography are newer techniques that can be used to image the cornea, including curvature and thickness, as well as the anterior segment.

Courtesy of Michael W Belin MD; rendered by C. H. ) CHAPTER ·2: Exa mi nation Techn iques for the Externa l Eye and Cornea. ,. 0 D Color Steps Keratometric • 41 Axial Power " . 00 "' . 00 "' , NO ,. 00 rn . , "' Tangential Power Figure 2·26 Topogra phy of a patie nt with keratoconus . The top image shows axial cu rvature, the bottom, tange ntial curvature. Note that the steeper curve on the bottom is more closely aligned to the cone. (Courtesy of John E. ) A third map, the mean curvature map, does not require the perpendicular ray to cross the visual axis.

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2011-2012 Basic and Clinical Science Course, Section 8: External Disease and Cornea (Basic & Clinical Science Course) by James J. Reidy MD

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