What is stereopsis and which conditions can impair depth perception?

What is stereopsis and which conditions can impair depth perception?

• A. Stereopsis is depth perception derived from monocular cues alone.
• B. Stereopsis is depth perception from binocular disparity; impairments occur with strabismus, amblyopia, or lesions in V1 or extrastriate areas.
• C. Stereopsis is color depth perception; impairments occur with color blindness.
• D. Stereopsis is auditory depth perception; impairments occur with hearing loss.

Answer: (B)

Stereopsis is depth perception that arises from binocular disparity—the slight differences between the images each eye sees—and the brain fuses these views to create a single, three‑dimensional perception. This ability depends on proper eye alignment and intact neural processing of disparity cues. When the eyes are misaligned (strabismus) or one eye is weakened or suppressed (amblyopia), or when there are lesions in the primary visual cortex (V1) or in higher, extrastriate visual areas that compute disparity, stereopsis is impaired. Monocular cues can still provide some depth information, but true stereopsis specifically requires input from both eyes and the brain’s integration of that binocular disparity.

Stereopsis is depth perception that arises from binocular disparity—the slight differences between the images each eye sees—and the brain fuses these views to create a single, three‑dimensional perception. This ability depends on proper eye alignment and intact neural processing of disparity cues. When the eyes are misaligned (strabismus) or one eye is weakened or suppressed (amblyopia), or when there are lesions in the primary visual cortex (V1) or in higher, extrastriate visual areas that compute disparity, stereopsis is impaired. Monocular cues can still provide some depth information, but true stereopsis specifically requires input from both eyes and the brain’s integration of that binocular disparity.