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The lowest and most fundamental level of binocular vision, where the visual system is capable of receiving and processing input from both eyes simultaneously, but the two images are not yet fused into a single, three-dimensional perception.
read more about simultaneous perception ...The three stages of binocular vision are: 1. Simultaneous Perception, 2. Fusion (combining the two images), and 3. Stereopsis (depth perception).
Tested using devices like the major amblyoscope (synoptophore) or polarized glasses, which present different targets to each eye separately.
The inability to achieve simultaneous perception suggests the patient is suppressing the image from one eye, often due to strabismus (eye turn) or significant uncorrected refractive error.
A person with strabismus may achieve simultaneous perception under controlled testing conditions, but often suppresses one eye under normal viewing to avoid double vision.
The next level is Fusion, which is the neurophysiological mechanism that blends the slightly dissimilar images from the two eyes into a single, cohesive percept.
Yes. Simultaneous perception is a prerequisite for fusion, and fusion is a prerequisite for stereopsis (fine depth perception).