Final Answer:
A term that means 'pertaining to the eye' is ophthalmic (option 2).
Step-by-step explanation:
The term "ophthalmic" specifically relates to or pertains to the eye. It is derived from the Greek word "ophthalmos," meaning eye. In medical terminology, "ophthalmic" is commonly used to describe anything associated with the eyes, such as medications, procedures, or conditions. The other options do not directly relate to the eye; for example, "adenic" pertains to glands, "otic" relates to the ear, and "vascular" refers to blood vessels.
Therefore, the correct answer is ophthalmic (option 2) when indicating a term that describes something related to the eye in medical terminology.