Which combining form pertains to the eye or vision?

• A. Ophthalm/o
• B. Ocul/o
• C. Sarc/o
• D. Quadr/i

Answer: (B)

The main idea here is identifying the combining form that directly means eye. Ocul/o comes from the Latin oculus and appears in words like ocular (pertaining to the eye) and oculomotor (the nerve that moves the eye). It’s the most straightforward way to signal eye-related meaning in many terms.

Ophthalm/o also relates to the eye, but it’s more about the field and terms specifically tied to the eye’s anatomy and medicine (as in ophthalmology, ophthalmic). The other roots aren’t connected to the eye at all: sarc/o means flesh, as in sarcoma, and quadr/i means four, as in quadrilateral or quadriceps.

So the combining form for the eye is ocul/o.