By James J. Reidy MD
Discusses the constitution and serve as of the cornea and exterior eye and studies suitable exam ideas. Covers infectious and ocular floor illnesses, issues 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 recent IC3D class. Discusses poisonous and irritating accidents and corneal transplantation. includes many new colour pictures. 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)
Procedures for obtaining and cult uring speci mens for suspected infect io us conditions are discussed further in Chapter 4. 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.
The furrows between these enlarged fi brovascular stru ctures collect mucus and pus. CHAPTER 2: Examination Techniques for the Externa l Eye and Cornea. 23 A Figure 2-8 papillae . Papillary conjunctiviti s. A, Mild papillae. B, M oderate papillae. C, Marked (giant) 24 • External Disease and Co rnea Follicles Co njunctival lympho id tissue is normally present within th e substantia propria except in neonates, who do not have visible fo llicles. Conjunctival fo ll icles are rou nd or oval clusters of lymphocytes (Fig 2-9).
Corneal topography detects irregular astigmatism from contact lens warpage, keratoconus and other thinning disorders, corneal surgery, trauma, and postinflammatory and degenerative conditions. Different values obtained at subsequent examinations can Signal a change in corneal contour if the alignment of the eye and the instrument is the same. Computer-assisted topographiC modeling systems allow the clinician to detect subtle and minor variations in power distribution of the anterior corneal surface.
2011-2012 Basic and Clinical Science Course, Section 8: External Disease and Cornea (Basic & Clinical Science Course) by James J. Reidy MD