This trial tests if PTeye, a light-based tool, can help surgeons find parathyroid glands more easily during surgery. It targets patients with hyperparathyroidism to make surgeries quicker and reduce complications. The tool works by shining light on neck tissues to identify parathyroid glands. PTeye is a clinical prototype that has demonstrated high accuracy for label-free intraoperative parathyroid identification, even in the presence of ambient room lights.