If this theory were true, we’d all be walking around with invisible beams of light shooting out our eyes. The Emission theory suggests that, rather than photons on different objects emitting light which in turn we perceive, our eyes in fact emit light into our field of vision. Think it sounds ridiculous? Well apparently not to some. Results from a study in 2002 found that 50 per cent of American college students thought that this was really how our eyes work. We’d like to manipulate the light from our eyes into laser beams.