In this study lead researcher, Amy Chow, and her colleagues asked patients to pay attention to a specific set of dots among a group of distracting dots, all moving on a computer screen. However, the tracked dots were only visible in one eye the weaker eye while the distracting dots were visible only to the other eye the stronger eye. For people with normal vision as well as those with anisometropic amblyopia, showing different images between the two eyes didn't matter.
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Both groups were able to overcome the distracting interference and track the dots successfully. Patients with strabismic amblyopia, on the other hand, were unable to direct their attention to the target dots when they were visible to only the weaker eye. About thirty-five thousand Canadians—one per cent of the population—have strabismic amblyopia.
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The condition can be corrected in childhood, but treatment efficacy can be highly variable. These findings are a stepping stone in developing better treatments of lazy eye. Explore further.
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Eye, brain, and vision
Each eye sees a part of the outer world which is called its visual field. The total visual field is the sum of the right and left hemi-visual fields in each eye. Just like the visual field is divided into two hemi-fields, the retina, a layer of cells at the back of the eye, is divided in half.
In other words, light coming from anywhere in the left half of the visual environment projects onto the two right half-retinas, and the information is sent to the right hemisphere. This arrangement means that when are looking at something, each of the two retinas are seeing the same thing, providing binocular 3D vision.