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Prism correction. Prism lenses (here unusually thick) are used for pre-operative prism adaptation. Eye care professionals use prism correction as a component of some eyeglass prescriptions. A lens which includes some amount of prism correction will displace the viewed image horizontally, vertically, or a combination of both directions.
Vision therapy ( VT ), or behavioral optometry, is an umbrella term for alternative medicine treatments using eye exercises, based around the pseudoscientific claim that vision problems are the true underlying cause of learning difficulties, particularly in children. [1]
Dyslexia, previously known as word blindness, is a learning disability ('learning difficulty' in the UK [6]) that affects either reading or writing. [1] [7] Different people are affected to different degrees. [3] Problems may include difficulties in spelling words, reading quickly, writing words, "sounding out" words in the head, pronouncing ...
Prism adaptation is a sensory-motor adaptation that occurs after the visual field has been artificially shifted laterally or vertically. It was first introduced by Hermann von Helmholtz in late 19th-century Germany as supportive evidence for his perceptual learning theory (Helmholtz, 1909/1962). [1]
Causes. brain bleed, brain inflammation, brain tumor, dementia, epilepsy, lymphoma, other kinds of brain injuries, and stroke. Diagnostic method. magnetic resonance imaging. Hemianopsia, or hemianopia, is a visual field loss on the left or right side of the vertical midline.
Orthographic dyslexia, a subtype of dyslexia, results in difficulty decoding and encoding skills due to slow and inaccurate rates of storing word and letter formations into memory.