Reply to comment on: Sandwich technique using combination of perfluoropropane and silicone oil for inferior retinal detachment

Sir,

We thank Mehrotrafor putting forth the queries and showing interest in our article.[1] After fluid air exchange, to achieve an isovolumetric concentration of gas, the intraocular gas perfluoropropane (C₃F₈) was injected through the infusion port. This was followed by silicone oil injection through the superior port under direct visualization to fill up to half of the vitreous cavity.[2] The intraocular gas (C₃F₈) port was the last one to be removed in case further gas injection was needed.

We understand the fact that the escape route for gas may be hindered while using silicone oil cannula on one side and endoilluminator on the other. However, escape of gas was allowed through the superior port itself by removing endoilluminator intermittently. The exit of gas while using valved cannula can be further challenging and risk of intraocular pressure rise remains. Though venting may be helpful for escape of gas in valved cannulas, the frequent removal of venting extension for reintroduction of endoilluminator can be cumbersome.

We noted that anterior chamber was full of gas at the end of surgery in aphakic eyes. We did not identify any forward push of iris diaphragm or collapse of anterior chamber in our study eyes.

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