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The test is based on the principle of diplopic projection. [1] Dissociation of the deviation is brought about by presenting a red line image to one eye and a white light to the other, while prisms are used to superimpose these and effectively measure the angle of deviation (horizontal and vertical).
In some cases, diplopia disappears without medical intervention, but in other cases, the cause of the double vision may still be present. Certain people with diplopia who cannot achieve fusion and yet do not suppress may display a certain type of spasm-like irregular movement of the eyes in the vicinity of the fixation point (see: Horror fusionis).
The symptoms and signs associated with convergence insufficiency are related to prolonged, visually demanding, near-centered tasks. They may include, but are not limited to, diplopia (double vision), asthenopia (eye strain), transient blurred vision, difficulty sustaining near-visual function, abnormal fatigue, headache, and abnormal postural adaptation, among others.
The symptoms of vestibulocerebellar syndrome vary among patients but are typically a unique combination of ocular abnormalities including nystagmus, poor or absent smooth pursuit (ability of the eyes to follow a moving object), strabismus (misalignment of the eyes), diplopia (double vision), oscillopsia (the sensation that stationary objects in the visual field are oscillating) and abnormal ...
DIBELS (Dynamic Indicators of Basic Early Literacy Skills) is a series of short tests designed to evaluate key literacy skills among students in kindergarten through 8th grade, such as phonemic awareness, alphabetic principle, accuracy, fluency, and comprehension. The theory behind DIBELS is that giving students a number of quick tests, will ...
Young children with strabismus normally suppress the visual field of one eye (or part of it), whereas adults who develop strabismus normally do not suppress and therefore suffer from double vision . This also means that adults (and older children) have a higher risk of post-operative diplopia after undergoing strabismus surgery than young children.
The Differential Ability Scales (DAS) is a nationally normed (in the US), and individually administered battery of cognitive and achievement tests. Into its second edition (DAS-II), the test can be administered to children ages 2 years 6 months to 17 years 11 months across a range of developmental levels.
The Brigance Inventory of Early Development ii (IED-ii) is a child development assessment. It is designed to provide information on how a child is performing in ...