Patients generally choose it because it's done in a single procedure and they want a more natural result, McCarthy says.

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"It is not standard practice or recommended procedure for a single pilot to read newspapers while operating an aircraft, " a spokesman for the trade group says.

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The procedure sees the surgeon operate through a single cut, minimising the chance of scarring.

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To make it easier to do it right, some ICUs now gather all the equipment needed on a single cart ahead of time and give nurses permission to halt a central line procedure if they see a doctor doing it wrong.

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In general, standard operating procedure in microscopy is a private, one-on-one, single user experience.

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