Superman's laser vision is a step closer to reality thanks to discoveries made by Scottish scientists.

Researchers from St Andrews University have created ultra-thin contact lenses which allow the wearer to shoot laser beams from their eyes.

The ocular lasers have been shown to provide precise beams of light, which would allow for security features such as banknote verification.

The team used organic semiconductors to develop the ultra-thin membrane laser, which could be worn for use in a medical setting.

The researchers explained the threshold of their membrane lasers is compatible with the requirements for safe operation in the human eye such as those in biophotonics and photomedicine.

Professors Malte Gather, Ifor Samuel and Graham Turnbull were also able to demonstrate ocular lasing using the cow eye as a model system.

The new laser uses a fundamental limit in weight and thickness, as well as an exceptional mechanical flexibility, which allows them to be put onto a contact lens or bank note.

Professor Malte Gather said: "In ancient Greece, Plato believed that visual perception is mediated by 'eyebeams' - beams actively sent out by the eyes to probe the environment.

"Plato's emission theory has of course long been refuted, but superheroes with lasers in their eyes live on in popular culture and comic books.

"Our work represents a new milestone in laser development and, in particular, points the way to how lasers can be used in inherently soft and ductile environments, be it in wearable sensors or as an authentication feature on banknotes."