Term
| Functional Requisites for Binocular Vision |
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Definition
1. Frontally located eyes
2. Accurate foveal fixation with each eye
3. Approximately equal visual acuity in each eye
4. Similar retinal images for each eye
5. Normal oculomotor system (motor fusion)
6. Normal retinal correspondence and fusion (sensory fusion) |
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Term
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Definition
| straight-eyed or relaxed viewing, under-convergence to image the right half-view on the right eye's retina and left view on the left retina |
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Term
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Definition
| cross-eyed viewing over convergence to image the right half-view on the left eye's retina and left view on the right retina |
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Term
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Definition
| Difference in the vergence angles between two objects |
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Term
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Definition
| direction and magnitude of disparity are relative to a fixation distance |
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Term
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Definition
| lines of sight intersect in front of the reference, base out disparity |
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Term
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Definition
| lines of sight intersect behind the reference, base in disparity |
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Term
| Normal stereopsis requires ______ and ______ mechanisms |
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Definition
| normal motor, sensory fusion |
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Term
| Fixation disparities are classified as what? |
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Definition
| Eso (over-convergence) (uncrossed) and exo (under-convergence) (crossed) |
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Term
| Positive fusional convergence |
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Definition
| increased convergence initated by crossed disparity (base out prism or exophoria) |
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Term
| Negative fusional convergence |
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Definition
| divergence movement initiated by uncrossed disparity (base in prism or esophoria) |
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