At Brother World Japan 2010, Brother Industries presented the AiRScouter, a head-mounted transparent display that projects images directly onto the retina.

This display uses the "persistence of vision" effect to project pictures onto the retina. It does this by shining a light, at a level of brightness that's safe for the eyes, and moving the light at high speed. The images projected on the retina are recognized by the visual sense, making it seem just as if they are floating just in front of the eyes.