Chorded keyboard (a writing system for the blind) uses either 6 or 8 tactile 'points' from which all letters and numbers are formed. When Louis Braille invented it, it was produced with a needle holing successively all needed points in a cardboard sheet. In 1892, Frank Haven Hall, superintendent of the Illinois Institute for the Education of the Blind, created the Hall Braille Writer, which was like a typewriter with 6 keys, one for each dot in a braille cell. The Perkins Brailler, first manufactured in 1951, uses a 6-key chord keyboard (plus a spacebar) to produce braille output, and has been
Dot Cotton she isn't scared of Halloween but of the world. Dot reveals that she thinks she is going blind but then kicks Patrick out of the house. When he leaves, it is revealed that Dot cannot see anything clearly. Patrick books Dot a doctor's appointment; the doctor suspects age-related macular degeneration, which is later confirmed. Dot starts treatment but she is annoyed that her eyesight does not improve much. She turns down Ronnie's offer of paying for surgery to permanently fix her sight. Abi invites Dot to Christmas in Exeter but Dot insists she has plans of her own. The launderette