The present invention relates to input devices and particularly to input devices for use with computer and telecommunications systems andor other object systems andor devices. By combining glucosamine sulfate, sodium hyaluronate and chondroitin sulfate, the triple natural polymer viscoelastic compositions of this invention can provide a viscoelastic agent at a surgical site that not only serves as a protective agent to ocular tissues, but that can also act as an agent to alleviate pain and inflammation associated with ocular surgery. In one embodiment, the firing tip contains 2. The second plurality of bits of digital information are for operating the device when operating parameters are within a nominal range. The contact surfaces could be spaced apart along a length of the groove flank andor along a height of the groove flank.