Ebook Manual for eye examination and diagnosis (9/E): Part 2
➤ Gửi thông báo lỗi ⚠️ Báo cáo tài liệu vi phạmNội dung chi tiết: Ebook Manual for eye examination and diagnosis (9/E): Part 2
Ebook Manual for eye examination and diagnosis (9/E): Part 2
Chapter 6Slit lamp examination and glaucomaThe slit lamp projects a beam of variable intensity onto the eye, which is viewed through a microscope (Fig Ebook Manual for eye examination and diagnosis (9/E): Part 2g. 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).CorneaThe cornea is the transparent, anterior continu Ebook Manual for eye examination and diagnosis (9/E): Part 2ation of the sclera devoid of both blood and lymphatic vessels. The grey corneoscleral junction is called the limbus. A slit beam cross-section of a nEbook Manual for eye examination and diagnosis (9/E): Part 2
ormal cornea reveals the following as shown in Figs 221, 222, and 223A:1anterior band: epithelium on Bowman's membrane;2cross-section; through stroma;Chapter 6Slit lamp examination and glaucomaThe slit lamp projects a beam of variable intensity onto the eye, which is viewed through a microscope (Fig Ebook Manual for eye examination and diagnosis (9/E): Part 2ior segment, c, cornea; A, anterior chamber; I, iris; L, lens; V, vitreous. Courtesy of Takashi Fujikado, MD.Manual for Eye Examination and Diagnosis, Ninth edition. Mark Leitman.76 © 2017 John Wiley & Sons, Inc. Published 2017 by John Wiley & Sons, Inc.Fig. 223 (A) Slit beam cross-section of a corn Ebook Manual for eye examination and diagnosis (9/E): Part 2ea. A, epithelium; B, stroma;c, endothelium. (B) Tomogram of anterior segment showing thickness of cornea greatest in periphery. Courtesy of Richard WEbook Manual for eye examination and diagnosis (9/E): Part 2
itlin, MD.The corneal epithelium is the superficial covering of the cornea that is four to six layers thick and sits on Bowman’s membrane. Its cells rChapter 6Slit lamp examination and glaucomaThe slit lamp projects a beam of variable intensity onto the eye, which is viewed through a microscope (Fig Ebook Manual for eye examination and diagnosis (9/E): Part 2 move toward the surface. The epithelial cells are also formed from the embryonic stem cells in the limbus (corneoscleral junction) and migrate across the cornea.The stroma is the clear connective tissue layer and is thinnest in the center of the cornea (545 pm). It is almost twice as thick near the Ebook Manual for eye examination and diagnosis (9/E): Part 2 limbus (Fig. 223B). It contains the most densely packed number of sensory fibers in the body, 400 times that of skin. Abrasions and inflammations (keEbook Manual for eye examination and diagnosis (9/E): Part 2
ratitis) are, therefore, very painful. "Kerato" is a prefix that refers to cornea.The deepest endothelial layer sits on Descem-et's membrane and is onChapter 6Slit lamp examination and glaucomaThe slit lamp projects a beam of variable intensity onto the eye, which is viewed through a microscope (Fig Ebook Manual for eye examination and diagnosis (9/E): Part 2luorescein.Corneal epithelial diseaseCommonly occurring epithelial abrasions (Figs 224 and 225), due to trauma, present with pain and a "red" eye. The de-epithelialized area stains bright green with fluorescein and a cobalt blue light. Rx:Fig. 225 Linear abrasions from trichiasis or particle under l Ebook Manual for eye examination and diagnosis (9/E): Part 2id.SLIT LAMP EXAMINATION AND GLAUCOMA77topical antibiotic, a cycloplegic (Cyclogel 1%), and an oral analgesic, with a pressure patch (two patches). MoEbook Manual for eye examination and diagnosis (9/E): Part 2
st abrasions clear quickly, within 24-48 hours, largely due to adjacent epithelial cells sliding over the abraded area.To facilitate the examination oChapter 6Slit lamp examination and glaucomaThe slit lamp projects a beam of variable intensity onto the eye, which is viewed through a microscope (Fig Ebook Manual for eye examination and diagnosis (9/E): Part 2continued use damages the cornea.Rarely, chemical or surgical trauma to the surface is so severe it destroys a large area of the limbus. In these cases, the epithelium cannot regenerate properly and a limbal cell transplant has to be done. Normal limbal tissue from the patient's other eye (autograft Ebook Manual for eye examination and diagnosis (9/E): Part 2), from a relative (allograft) (Fig. 226), or from a cadaver may be used.Corneal foreign bodies (Fig. 227) are removed with a sterile needle after plaEbook Manual for eye examination and diagnosis (9/E): Part 2
cing two drops of proparacaine. Antibiotic drops are then prescribed.Axenfeld nerve loops are intrascleral nerves that commonly appear normally as greChapter 6Slit lamp examination and glaucomaThe slit lamp projects a beam of variable intensity onto the eye, which is viewed through a microscope (Fig Ebook Manual for eye examination and diagnosis (9/E): Part 2 by trying to remove.Localized epithelial edema (Fig. 229) has a translucent appearance, unlike an ulcer, which is opaque. In the common condition called recurrent corneal erosion, a small patch of edema develops where the epithelium does not adhere well to Bowman's membrane. ThisFig. 226 A 360° lim Ebook Manual for eye examination and diagnosis (9/E): Part 2bal stem cell allograft: sutured or glued to sclera (T). Courtesy of Clara Chan, MD, and Edward J. Holland, MD, Cincinnati Eye Institute.Fig. 227 CornEbook Manual for eye examination and diagnosis (9/E): Part 2
eal foreign body. Courtesy of University of Iowa, Eyerounds.org.Fig. 228 Axenfeld loop. Courtesy of University of Iowa, Eyerounds.org.Fig. 229 RecurreChapter 6Slit lamp examination and glaucomaThe slit lamp projects a beam of variable intensity onto the eye, which is viewed through a microscope (FigChapter 6Slit lamp examination and glaucomaThe slit lamp projects a beam of variable intensity onto the eye, which is viewed through a microscope (FigGọi ngay
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