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  2. Braille - Wikipedia

    en.wikipedia.org/wiki/Braille

    Braille (/ หˆbreษชl / BRAYL, French: [bสษ‘j]) is a tactile writing system used by people who are visually impaired. It can be read either on embossed paper or by using refreshable braille displays that connect to computers and smartphone devices. Braille can be written using a slate and stylus, a braille writer, an electronic braille notetaker ...

  3. Color blindness - Wikipedia

    en.wikipedia.org/wiki/Color_blindness

    Color blindness or color vision deficiency (CVD) is the decreased ability to see color or differences in color. [ 2 ] The severity of color blindness ranges from mostly unnoticeable to full absence of color perception. Color blindness is usually an inherited problem or variation in the functionality of one or more of the three classes of cone ...

  4. List of people with color blindness - Wikipedia

    en.wikipedia.org/wiki/List_of_people_with_color...

    Started a project in 2003 to develop a sensor that transposed color frequencies into sound frequencies. [25] Cal Henderson: b. 1981 United Kingdom: Programmer: Worked on applications to make the Internet more accessible to colorblind people. [26] Matt Holland: red–green b. 1974 England Ireland: Association football player [27] Richard Hughes ...

  5. Visual impairment - Wikipedia

    en.wikipedia.org/wiki/Visual_impairment

    Visual or vision impairment (VI or VIP) is the partial or total inability of visual perception. In the absence of treatment such as corrective eyewear, assistive devices, and medical treatment, visual impairment may cause the individual difficulties with normal daily tasks, including reading and walking. [ 6 ]

  6. What's it like to be color blind?

    www.aol.com/article/lifestyle/2016/10/04/what-s...

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  7. English Braille - Wikipedia

    en.wikipedia.org/wiki/English_Braille

    English Braille, also known as Grade 2 Braille, [ 1 ] is the braille alphabet used for English. It consists of around 250 letters (phonograms), numerals, punctuation, formatting marks, contractions, and abbreviations (logograms). Some English Braille letters, such as โ ก ch , [ 2 ] correspond to more than one letter in print.

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