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Updated: February 23, 2024
Dyslexia is a common Learning Disability that primarily affects the skills involved in the reading and spelling of words. Despite having no relation to a person's general intelligence, this condition is most often characterized by difficulties in accurately recognizing words, poor decoding abilities and struggles with spelling and writing.
Dyslexia often becomes apparent during childhood, often when a child first begins to learn to read. Some common symptoms include unusual difficulty learning to read or write, problems with spelling, struggles with sequencing and organization and a tendency to write letters and numbers flipped in reverse or in the wrong sequence.
Not all people can see the number on one particular color blind test slide, but it might not be why you think. The image is commonly known as a Reverse Color Blind Test. People with normal vision will see nothing other than an abstract pattern of dots, but some people with color blindness, specifically red-green deficient vision, will see the number '73'.
Dr. Shinobu Ishihara, a professor at the University of Tokyo, created the Ishihara plates in 1917. The design of the test revolves around pseudoisochromatic plates, a collection of colored dots with varying sizes and hues. Most plates feature a hidden number or a line, and for individuals with normal color vision, these patterns or numbers are easily distinguishable. However, for those with color vision deficiencies (CVD), these patterns can be difficult or even impossible to identify.