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Aug 2011

Rethinking Surface Tension and Buoyancy—Reply

Author Affiliations

Author Affiliation: Department of Ophthalmology, Retina Service, Faculty of Medicine, Khon Kaen University Eye Center, Khon Kaen University, Khon Kaen, Thailand.

Arch Ophthalmol. 2011;129(8):1109-1110. doi:10.1001/archophthalmol.2011.177

In reply

We appreciate Gupta's discussion of the effect of surface tension and buoyancy force in retinal detachment repair and the mathematical postulations of Foster and Chou.1 Using air in pneumatic retinopexy is not a new idea. In 1993, Sebag and Tang2 performed pneumatic retinopexy using 0.8 mL of filtered air, and the reattachment rate was 86.7% (39 of 45 eyes) after single intravitreal injection. In this case series, a paracentesis of the anterior chamber was performed in all patients. In 1995, we3 also demonstrated a reattachment rate of 75% (15 of 20 eyes) following a single injection of 0.5 to 0.75 mL of filtered air for pneumatic retinopexy and a final reattachment rate of 90% (18 of 20 eyes) after subsequent procedures. On subgroup analysis, the reattachment rate in phakic eyes was 88.24% (15 of 17) following a single injection and 94.12% (16 of 17 eyes) after subsequent procedures. We concluded that pneumatic retinopexy with air can be performed in some selected phakic retinal detachment with a success rate comparable with the procedure using expansile gases.

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