There are many different operations now available for the correction or treatment of glaucoma. Most of the procedures center around lowering the pressure. Lasers have been available for this conditions since the mid 1980s and are still used as a relatively non-invasive method to achieve lower pressure. If the laser and or medications are not able to control the pressure, a small shunt can be placed in the eye to let the fluid in the eye drain through different channels and thereby lower the pressure. These shunts are extremely fine and cannot even be seen without a microscope.