2011-2012 Basic and Clinical Science Course, Section 10: by George A. Cioffi MD

By George A. Cioffi MD

Themes on glaucoma contain the epidemiologic features; hereditary and genetic components; intraocular strain and aqueous humor dynamics; and medical review, scientific administration and surgical remedy. includes various pictures illustrating disorder entities and surgical innovations. final significant revision 2008 2009.

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Extra resources for 2011-2012 Basic and Clinical Science Course, Section 10: Glaucoma (Basic & Clinical Science Course)

Sample text

Portable electronic applanation devices employ a disposable cover, which should be replaced immediately after each use. The Schi0tz 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 ~f 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.

3rd ed. ) damage determine the patterns of visual field loss seen in glaucoma, which are described and illustrated later in this chapter. The anterior optic ne rve can be divided into 4 layers (Fig 3-11 ): nerve fiber prelaminar laminar retrolaminar The most anterior zone is the superficial nerve fiber layer region, which is continuo us with the nerve fiber layer of the reti na. This region is primarily composed of the axons of the RGCs in transition from the superficial retina to the neuronal component of the optic nerve.

The relationship between blood pressure and lOP may be important CHAPTER 2: Intraocula r Pressure and Aqueous Humor Dynam ics. 27 in optic nerve damage: systemic hypotension, especially during sleep, has been suggested as a possible cause of decreased optic nerve perfusion resulting in damage. Clinical Measurement of Intraocular Pressure Measurement of lOP in a clinical setting requires a force that indents or flattens the eye. Applanation ton ometry is the method used most widely. It is based on the Imbert-Fick principle, which states that the pressure inside an ideal dr y, thin-walled sphere equals the force necessary to flatten its surface divided by the area of the flatte ning: p= PIA where P = pressure, P = force, and A = area.

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