What body part is referred to by the prefix "opt-"?

The prefix "opt-" is derived from the Greek word "opsis," which means vision or sight. It specifically pertains to the eyes and is commonly used in various medical terms related to vision. For example, terms like "optometry" (the practice of measuring vision) or "ophthalmoscope" (an instrument used to view the interior of the eye) both incorporate the "opt-" prefix, indicating a connection to the eyes and sight. Understanding this prefix helps establish a clear link between the terminology and its relation to ocular health and vision-related fields.