The Argentinian flag sign is a known complication in intumescent white cataracts, which arises instantly after an initial prick with a sharp hypodermic needle on a stretched out anterior capsule. Increased intralenticular pressure is believed to be responsible for propagation of the initial prick into a radial capsular tear. However, it is the 'linear cut' configuration of the initial prick, created by the hypodermic needle on the tense anterior capsule, which spontaneously opens up and propagates towards the periphery along its margins. To overcome this a novel instrument was devised, sewing needle microcapsulotome, to puncture the capsule and create a single or multiple round openings with smooth margins allowing the bag to decompress satisfactorily without yielding to disruptive intralenticular forces. This technique of sewing needle microcapsulotomy, to prevent Argentinian flag sign, was found to be highly effective and safe in a series of surgeries on intumescent cataracts.