A device designed to fit over the distal end of a non-surgically-invasive device with optical functionality (e.g., laser beam-guide, optical scanning handpiece, endoscope) during use, to act as a cover/shield to avoid direct contact to the eye and/or cross-contamination between patients; it is not intended to act as a spacer. It is typically a small rigid partially- or fully- transparent plastic device. This is a single-use device.