Which combining form means relating to the eye?

• A. Ophthalm/o
• B. Ocul/o
• C. Lip/o
• D. Prim/o

Answer: (A)

Recognizing the combining form that means eye. Ophthalm/o directly denotes the eye and forms core terms like ophthalmology and ophthalmic, which makes it the clearest way to express anything relating to the eye as an organ. The other eye-related option, ocul/o, is also about the eye but is used in different word forms (like ocular or oculomotor) and isn’t the primary root for “relating to the eye” in the same straightforward sense. Lip/o means fat, and prim/o means first, so they don’t fit the eye concept at all.