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Saccadic Eye Movements These are the movements when the eyes 'jump' very quickly from one object to another. An example is when the eyes move very fast to look directly at an object that may be coming in from one side to enable a better look to be made such as in driving. Another example is that of moving from one word to the next letter group in reading. This is usually sequential in nature and very fast. Problems often arise when the saccadic movement is consistently over or under shooting. When this happens there is often a tendency to loose ones place during reading and for there to be a loss of comprehension and fluency in reading. |
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Sight The ability to resolve or 'see'. Usually thought of as the ability to see very small objects at a long distance. Sight should be thought of as a different skill than 'vision, which involves the ability to distinguish the small objects and to interpret them. This depends on adequate visual experience and good sight. |
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Short term memory The ability to remember information that has been heard recently. ie. over a very short space of time. This information is often associated with symbols and is important for tasks such as learning to read, copying, spelling. Visual recall is inevitable required in the early stages of learning to read - sight vocabulary and flash cards etc. |
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Spatial Skills The ability to relate to areas around. The relative position of one object to another. It affects practical skills like handwriting and body posture. |
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Stereo Vision (stereopsis or
stereoscopic vision) A by product of good binocular vision; vision wherein the separate images from two eyes are successfully combined into one three-dimensional image in the brain. |
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Strabismus ("crossed eye",
"lazy eye", "wandering eye", esotropia, exotropia,
hyperptropia) Affects approximately 4 out of every 100 children. It is a visual defect in which the two eyes point in different directions. One eye may turn either in, out, up, or down while the other eye aims straight ahead. Due to this condition, both eyes do not always aim simultaneously at the same object. This results in a partial or total loss of stereo vision and binocular depth perception. The eye turns may be visible at all times or may come and go. In some cases, the eye misalignments are not obvious to the untrained observer. |
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