What is the clinical significance of the calcarine sulcus in vision?

• A. It marks the boundary between the optic nerve and retina.
• B. It is the site of the retinal pigment epithelium.
• C. The primary visual cortex lies around the calcarine sulcus; lesions produce contralateral homonymous visual field defects.
• D. The calcarine sulcus is responsible for color vision.

Answer: (C)