The Laser Lens is a power-up in the Mario series and it first appeared in Super Mario Land 3D. It turns Mario into Laser Mario, allowing him to shoot lasers that can bounce from corners in the ground to kill enemies and press hidden switches and other things.
The Laser Lens first appear in this game. It is mainly found in Worlds 7, 9 and Special. It's function is to shoot various lasers that can easily kill enemies. The player can also shoot lasers at respective corners to press switches that cannot be reached.