Which testing method relies on monocular cues, contour testing or global testing?

• A. Contour testing
• B. Global testing
• C. MEM
• D. Haidinger’s brush

Answer: (A)

Contour testing relies on monocular cues like edges, contours, and shading to convey depth. These cues can inform depth perception even with one eye, so this method doesn’t force the brain to depend solely on binocular fusion. Global testing, by contrast, uses random-dot patterns that contain no recognizable monocular cues; depth is determined only by binocular disparity, requiring functional stereo vision. The other two tests serve different purposes—MEM evaluates accommodative responses using monocular blur cues, and Haidinger’s brush assesses macular/perceptual function with entoptic polarization phenomena. So the method that depends on monocular cues is contour testing.