By James J. Reidy MD
Discusses the constitution and serve as of the cornea and exterior eye and stories proper exam options. Covers infectious and ocular floor ailments, 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 stressful accidents and corneal transplantation. includes 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)
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).
Specimens can also be obtained from the contralateral con jun ctiva for comparison. 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.
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. After the central cornea's sensitivity is measured, a map is produced of the cornea (and sometimes of the bulbar conjunctiva) by testing the superior, temporal, inferior, and nasal quadrants sequentially.