Which testing approach utilizes monocular cues, contour testing or global testing?

• A. Contour testing
• B. Global testing
• C. MEM
• D. Visuoscopy

Answer: (A)

Monocular cues provide depth information from a single eye, so a test that presents a target with clear contours and edge information can be interpreted using those cues even when one eye is closed. Contour testing leverages these cues—edges, shading, occlusion, and relative size within a defined shape—allowing depth perception to be inferred without requiring binocular fusion. Global testing, in contrast, uses random-dot stimuli that strip away obvious monocular cues; there’s no recognizable contour or texture to guide depth perception with one eye, so depth must come from binocular disparity between the two eyes, i.e., true stereopsis. Therefore, contour testing is the approach that utilizes monocular cues.