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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.
Dyslexia is a reading disorder wherein an individual experiences trouble with reading. Individuals with dyslexia have normal levels of intelligence but can exhibit difficulties with spelling, reading fluency, pronunciation, "sounding out" words, writing out words, and reading comprehension. The neurological nature and underlying causes of ...
Adolph Kussmaul. The concept of "word-blindness" (German: "wortblindheit"), as an isolated condition, was first developed by the German physician Adolph Kussmaul in 1877. [ 1 ][ 2 ] Identified by Oswald Berkhan in 1881, [ 3 ] the term 'dyslexia' was later coined in 1887 by Rudolf Berlin, [ 4 ] an ophthalmologist practicing in Stuttgart, Germany ...
3–7% [2][5] 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 ...
David P. Hurford is a psychologist and researcher who specializes in dyslexia /reading difficulties and attention deficit hyperactivity disorder (ADHD). He is a professor and chair of the Department of Psychology and Counseling at Pittsburg State University and directs the Center for Research, Evaluation and Awareness of Dyslexia (Center for ...
International Dyslexia Association. To study and treat dyslexia as well as related language-based learning disabilities. [3] The International Dyslexia Association (IDA) is a non-profit education and advocacy organization devoted to issues surrounding dyslexia. Its headquarters are located in Pikesville, Maryland, United States.
Dyslexia. Dyslexia is a disorder characterized by problems with the visual notation of speech, which in most languages of European origin are problems with alphabet writing systems which have a phonetic construction. [1] Examples of these issues can be problems speaking in full sentences, problems correctly articulating Rs and Ls as well as Ms ...
Suppression of an eye is a subconscious adaptation by a person's brain to eliminate the symptoms of disorders of binocular vision such as strabismus, convergence insufficiency and aniseikonia. The brain can eliminate double vision by ignoring all or part of the image of one of the eyes. The area of a person's visual field that is suppressed is ...