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                     The blind are people 
                      who cannot see because their eyes are damaged. 
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                A) 
                BASIC CHARACTERISTICS OF THE BLIND
                
                :: 
                The blind generally use a long white cane, which helps 
                them to go around. 
              :: 
                The blind should be guided through a building or town for the 
                first visit. Then, they memorise the route and are able 
                to go alone.
              :: 
                Only a small percentage of the blind have guide dogs. 
              :: 
                Braille is a system of reading by touch in which the letters 
                are printed as groups of six raised dots (like a domino) that 
                the blind can feel with their fingers. 
              :: 
                Moon is a system of reading by touch in which the letters 
                are made of raised shapes, based on the standard alphabet. It 
                is easier to learn than Braille.
               
              
              B) 
                ACCESSIBLE ENVIRONMENTS FOR THE BLIND
              :: 
                Recorded messages are appropriate for the blind.
              :: 
                Signals and signs should have large letters and numbers 
                and raised letters and numbers as well as an adequate colour contrast.
              :: 
                Lifts should have buttons in braille and recorded messages.
              :: 
                Public telephones should be adapted for the blind.
              :: 
                Carpets are not desirable because they absorb the sound 
                reflected up from walking surfaces.
              :: 
                Steps and stairs should not have open risers or protruding 
                nosings.
              :: 
                Steps and stairs should always have an adequate double handrail 
                on both sides.
              :: 
                Acoustic streetlights should always be preferred.
              :: 
                Urban furniture should not be placed in the middle of the 
                way.
              :: 
                Public transport should have acoustic recorded messages 
                to announce the stops.
              :: 
                Hazards such as projecting windows should be avoided.
              :: 
                Revolving doors should be avoided.
              :: 
                Warnings and alarms should have audible signals.