How can fiber optics be used in medicine?
remote imaging for laparoscopic surgery
fiber optics allows for light to be both transmitted and received through an extremely thin diameter opening during surgeries - laparoscopic surgery (also called minimally invasive surgery) utilizes fiber optics (ie. the total internal reflection of light within a refractive media) to perform surgeries that cause less damage and heal more quickly than previous methods of surgery.
Knee surgeries (as I can personally attest to) can often be performed with extremely small incisions, fiber optics allows for the inner cavity being operated on to be lit up and imaged during the procedure.