We would like to call attention to a phenomenon of calcification of various hydrophilic acrylic intraocular lenses (IOLs) following procedures using intracameral injections of gas. Calcification is localized to the anterior surface/subsurface of the IOL and within the pupillary area. Poor quality of vision through the opacification has required IOL exchange in several cases. The explanted IOLs were analyzed by us and others.Saeed et al. 1 described a case in which sulphur hexafluoride and later perfluoropropane gas was used intracamerally to manage large iatrogenic Descemet membrane detachments observed during cataract surgery. A few weeks later, a fine haze was observed under the anterior surface of the hydrophilic acrylic IOL. Details on the aspect or nature of the IOL opacification were, however, not available in the report. Three cases of calcification of hydrophilic acrylic IOLs associated with intraocular injection of gas were recently compiled by Dhital et al. 2 The explanted IOL from one of those cases was analyzed in our laboratory. The patient, who had a history of Fuchs endothelial corneal dystrophy, had phacoemulsification with implantation of a hydrophilic acrylic IOL combined with Descemet-stripping automated endothelial keratoplasty (DSAEK) in February 2007, with subsequent intracameral injections of air and gas. The DSAEK was repeated in August 2007 with a complete gas fill of the anterior chamber. Approximately 1 month later, a central circular area of IOL opacification was noted. In the other 2 cases, IOL opacification was observed after intracameral injection of gas to control hypotony following trabeculectomy and after vitrectomy with cryotherapy and intravitreous injection of gas in an eye with a history of blunt trauma, respectively. The 3 cases by Dhital et al. 2 shared a distinctive pattern of opacification limited to the anterior surface and/or subsurface of the IOL and defined by the pupillary margin. The calcific nature of the deposits observed within the area of opacification was confirmed by histochemical staining and scanning electron microscopy coupled with energy-dispersive x-ray spectroscopy. 2 Our laboratory has recently analyzed another similar case of localized IOL calcification following DSAEK. The patient had Fuchs dystrophy and had had uneventful phacoemulsification with hydrophilic acrylic IOL implantation in June 2010. Descemetstripping automated endothelial keratoplasty with intracameral injections of air was performed in October 2010. Two months later, the patient complained of "foggy" vision. Opacification of the anterior surface of the IOL within the pupillary area was observed. Figure 1. Case of localized hydrophilic acrylic IOL opacification after DSAEK, leading to explantation. A: Clinical photograph taken after pupil dilation. The arrows delineate the area of opacification, which is denser in the upper right quadrant. B: Gross photograph of the IOL, which was bisected for explantation. C: Light photomicrograph of the explanted IOL showing the presence of deposits o...