By George A. Cioffi, MD
This part underwent significant revision for the 2008-2009 edition.Topics mentioned comprise the epidemiologic elements of glaucoma; hereditary and genetic elements; intraocular strain and aqueous humor dynamics; scientific overview; scientific administration of and surgical treatment for glaucoma. This version includes up to date tables and revised pictures, in addition to quite a few new photos illustrating either ailment entities and surgical recommendations.
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Additional info for 2008-2009 Basic and Clinical Science Course: Section 10: Glaucoma (Basic and Clinical Science Course 2008-2009)
The red line posterior to the trabecular mesh. venous pressure resulting in blood reflux into of G. A. Cioffi. MD.! either radially along the iris or circumferentially (in a serpentine manbody face. Vessels that cross the scleral spur to reach the trabecular meshwork are usually abnormal (Fig 3-6). The vessels seen in Fuchs heterochromic cyclitis are fine, branching, unsheathed, and meandering. Patients with neovascular coma have trunklike vessels crossing the trabecular meshwork. Contraction leads to PAS formation.
Portable electronic applanation devices employ a disposable cover,which should be replaced immediately after each use. The Schiotz tonometer requires disassembly to clean both the plunger and the footplate. Unless the plunger is clean (as opposed to sterile), the measurements may be falsely elevated because of increased friction between the plunger and the footplate. CHAPTER 2: Intraocular Pressure and Aqueous Humor Dynamics. 31 A pipe cleaner can be used to clean the inside of the footplate, removing tears and any tear film debris.
In applanation tonometry, the cornea is flattened, and lOP is determined by measuring the applanating force and the area flattened (Fig 2-4). 06 mm diameter. At this diameter, the resistance of the cornea to flattening is counterbalanced by the capillary attraction of the tear film meniscus for the tonometer head. Furthermore, the lOP (in mm Hg) equals the flattening force (in grams) multiplied by 10. A split-image prism allows the examiner to determine the flattened area with great accuracy. Fluorescein in the tear film is used to outline Direction of_ observer's view -- Area of corneal Housing flattening n 1 Adjustment knob A Meniscus width B t - - - - - - - - - -~.
2008-2009 Basic and Clinical Science Course: Section 10: Glaucoma (Basic and Clinical Science Course 2008-2009) by George A. Cioffi, MD