Book excerpt: Describes for ophthalmologists aspects of using air or other gases in various types of intraocular surgery. Discusses the basic properties of gases and of interfaces between a gas and a fluid, movement of the gas, intraocular pressure and the management of it, effects on tissues, the clinical assessment of eyes that contain gas, ultrasonography, retinopexy in the presence of gas, the history of intraocular gas in retinal surgery, pneumatic retinopexy, injecting gas during scleral buckling, gas-fluid exchange, treating macular holes, cataract and glaucoma surgery, miscellaneous uses of gas, gas preparation, and injection equipment. Annotation copyrighted by Book News, Inc., Portland, OR