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Volume Displacement of Scleral Buckles
John T. Thompson, MD;
Ronald G. Michels, MD
Arch Ophthalmol. 1985;103(12):1822-1824.
Abstract
• Indentation of the eye wall by a scleral buckle displaces volume from the vitreous cavity. We developed a mathematical formula to calculate the volume displacement caused by a scleral buckle and verified the accuracy of this mathematical model by performing scleral buckles in 21 cadaver eyes and three eyes undergoing retinal reattachment surgery. A single 5-mm radial sponge of moderate height displaces about 0.2 mL of fluid and a circumferential 2.5-mm-wide band of moderate height displaces about 0.5 mL of fluid. Larger circumferential tires of 7to 10-mm width displace 1.1 to 1.8 mL of fluid, depending on the height and configuration of the scleral buckle. A 7- to 10-mm-wide circumferential scleral buckle with a buckle height of 4 mm may displace up to 45% of the volume of the vitreous cavity. This volume displacement should be considered when injecting expansile gases or pharmacologic agents into the vitreous cavity.
Author Affiliations
From the Wilmer Ophthalmological Institute, The Johns Hopkins University School of Medicine, Baltimore.
Footnotes
Accepted for publication Aug 14, 1985.
Read in part before the Association for Research in Vision and Ophthalmology, Sarasota, Fla, May 6, 1985.
Reprint requests to Maumenee 127, Johns Hopkins Hospital, 600 N Wolfe St, Baltimore, MD 21205 (Dr Thompson).
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