Đang chuẩn bị liên kết để tải về tài liệu:
Eye examination and diagnosis - Handbook of manual (Ninth edition): Part 2

(BQ) Continued part 1, part 2 of the document Eye examination and diagnosis - Handbook of manual (Ninth edition) has contents: Retinal anatomy, fundus examination, retinal blood vessels, pseudoxanthoma elasticum, vitreous, retinitis pigmentosa, retinopathy of prematurity, and other contents. Invite you to refer. | Eye examination and diagnosis - Handbook of manual (Ninth edition): Part 2 Chapter 6 Slit lamp examination and glaucoma The slit lamp projects a beam of variable intensity onto the eye, which is viewed through a microscope (Fig. 219). The long, wide beam is useful in scanning surfaces such as lids, conjunctiva, and sclera. The long, narrow beam is for cross-sectional views (Figs 220 and 221). The short, narrow, intense beam is used to study cellular details (Fig. 363). Fig. 219 Slit lamp. Cornea The cornea is the transparent, anterior contin- uation of the sclera devoid of both blood and lymphatic vessels. The grey corneoscleral junc- tion is called the limbus. A slit beam cross-sec- tion of a normal cornea reveals the following as shown in Figs 221, 222, and 223A: 1 anterior band: epithelium on Bowman’s membrane; 2 cross-section: through stroma; 3 posterior band: endothelium on Descemet’s membrane. Fig. 220 Slit lamp beam. I C Limbus Epithelial Cells V A L Bowman’s Membrane Stroma Endothelial Cells Descemet’s Membrane Fig. 221 Slit lamp view of anterior Anterior Chamber segment. C, cornea; A, anterior chamber; I, iris; L, lens; V, vitreous. Fig. 222 Cross-section of cornea. Courtesy of Takashi Fujikado, MD. Courtesy of Pfizer Pharmaceuticals. Manual for Eye Examination and Diagnosis, Ninth edition. Mark Leitman. 76 © 2017 John Wiley & Sons, Inc. Published 2017 by John Wiley & Sons, Inc. (A) (B) Fig. 223 (A) Slit beam cross-section of a cornea. A, epithelium; B, stroma; C, endothelium. (B) Tomogram of anterior segment showing thickness of cornea greatest in periphery. Courtesy of Richard Witlin, MD. The corneal epithelium is the superficial cov- ering of the cornea that is four to six layers thick and sits on Bowman’s membrane. Its cells regenerate quickly so that 40% of the surface can regenerate in 24 hours. New cells are generated in the deepest layer sitting on Bowman’s