By James J. Reidy MD
Discusses the constitution and serve as of the cornea and exterior eye and reports appropriate exam ideas. Covers infectious and ocular floor ailments, problems and surgical procedure of the ocular floor, immune-mediated and neoplastic problems, congenital anomalies and degenerations. A lately up-to-date bankruptcy at the genetics of corneal dystrophies displays the hot IC3D category. Discusses poisonous and anxious accidents and corneal transplantation. comprises many new colour pictures. lately revised 2010 2011.
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Additional info for 2011-2012 Basic and Clinical Science Course, Section 8: External Disease and Cornea (Basic & Clinical Science Course)
Figure 2·17 Ultrasound bi omicrosco pi c visualization of the entire anterior se gment, including structure s behind the iris pigment epithelium, th ereby perm itting precise determ ination of the sulcus-to-sulcus measu rements prior to pha ki c refract ive implant. (Reprodu ced with permission from Goins KM Wagoner MD. ) 34 • Extern al Disease and Cornea Techniques involving the Scheimpflug camera, scann ing-slit topography devices, and OCT are non contact, which offers some practical advantages, including less training for image acquisition .
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.
Various etiologies, acting, at teast in part, by the mechani sm of reflex secretory block, may cause dry eye, including refractive surgery (LASIK dry eye), contact lens CHAPTER 3: Ocu lar Surface Disea se: Diagnostic Approach. 51 wear, and the chronic abuse of topical anesthetics. Individual etiologies often cause dry eye by several interacting mechanisms. Classification: Major Etiologic Causes of Dry Eye Interpret ing studies that investigate the ris k factors, pathogenesis, and therapy of dryeye cond itions has been complicated in the past by a lack of accepted d iagnostic criteria and standardized, specific diagnostic tests.
2011-2012 Basic and Clinical Science Course, Section 8: External Disease and Cornea (Basic & Clinical Science Course) by James J. Reidy MD