Nano-Drops are a new technology that provides a temporary treatment for refractive errors. These eye drops work by introducing activated nanoparticles which “stamp” the corneal epithelium in a specific assembly. A laser pulse is what activates the nanoparticles and by changing the laser pulse pattern the Nano-Drops can locally change the refractive index. This procedure is simple and can be done at home by a small laser connected to a smart phone. Nano Drops have not been tested on humans, but have shown to improve mild refractive errors in pigs.