The prototype spectacles have been designed by scientists at Tokyo's National Institute of Informatics.
The glasses are equipped with a near-infrared light source, which confuses the software without affecting vision.
Law enforcers, shops and social networks are increasingly using facial-recognition software.
Prof Isao Echizen said: "As a result of developments in facial recognition technology in Google images, Facebook et cetera and the popularisation of portable terminals that append photos with photographic information [geotags]... essential measures for preventing the invasion of privacy caused by photographs taken in secret and unintentional capture in camera images is now required."
The near-infrared light "appends noise to photographed images without affecting human visibility," he said.
Prof Echizen said the glasses, which connect to a pocket power supply, would be reasonably priced, but there are some simpler alternatives.
Heavy make-up or a mask will also work, as will tilting your head at a 15-degree angle, which fools the software into thinking you do not have a face,
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