Final answer:
Stereopsis can create a sense of depth even when the eyes are stationary, under certain conditions (C). This process is key to experiencing 3-D movies and does not rely solely on eye movements to provide depth cues. It utilizes the disparate images provided to each eye to produce a three-dimensional perception. Individuals with stereoblindness, however, rely on monocular cues as they cannot perceive depth binocularly.
Step-by-step explanation:
Stereopsis is the perception of depth produced by the reception in the brain of visual input from both eyes in combination, creating a sense of three-dimensional space. The answer to whether stereopsis can create depth even when the eyes don't move is C) Yes, in certain conditions. Even without eye movement, the brain can process the different images from each eye to create a sense of depth. This phenomenon is integral to the experience of 3-D movies, where each eye receives slightly different images that, when combined in the brain, give a perception of depth within a two-dimensional screen.
The notion of objects moving in the same direction but at different rates, as perceived by each eye, indicates an object is traversing the visual field at an angle, due to what's known as motion parallax. This is another way our brains interpret spatial movement and a form of depth perception. So, stereopsis doesn't rely solely on eye movement to provide depth cues, as it can also utilize disparities in the images presented to each eye. However, conditions such as stereoblindness prove that binocular cues are crucial for stereopsis since individuals with this condition cannot perceive depth in the standard binocular way and instead rely more on monocular cues.