The Retinally-Projected Operating System, more commonly referred to by its acronym RPOS, is by far the most popular cybernetic implant available to the general public today.
Incorporating the latest in microprocessor technology and holographic imaging, the RPOS' function is precisely as its name suggests, facilitating easier tasks and a higher quality of life by projecting a fully-fledged operating system directly onto the user's retina.
Although advertised as an ocular implant, due to the focus of its implementation, the RPOS is actually a cerebral implant, although not a very invasive one. By connecting the holographic imagers and microprocessors embedded in the walls of the eye sockets to the brain stem, the user - with sufficient practice, of course - is able to control the RPOS in any way they wish simply by thought alone.
With the advent of Psi Monks, many think that thought-controlled interfaces are a new technology, pioneered along with plasma-based weaponry. In actual fact, thought-controlled interfaces are centuries old, created in the early 21st Century to accomodate those suffering with full-body paralysis and other debilitating conditions with communication or movement. While the technology back then was very much rudimentary, the knowledge contained within the Ceres Disks has allowed the scientists and technicians seven centuries later to continue the work, advancing things immensely.
With cybernetics in the actual eyeball kept to a bare minimum, the lack of invasiveness with the entire procedure has ensured that the RPOS continues to be an appealing prospect and, with modifications made by everyone from Biotech themselves all the way down to the home-based hobby coder, the functionality of the RPOS can be expanded exponentially, albeit with varying levels of safety and legality.