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Many telephones
use small text displays that show dark characters on a mid-tone
background. This is very difficult to read for most people with
low vision.
It is very
important to display text and numbers in a way that provides maximum
contrast between the characters and the background.
Pale colours
and colours which are close in tone should be avoided.
White or yellow
type on black or a dark colour is more legible provided that the
typeface weight and size are suitable. Small type and very bold
type tend to blur for some people, reducing legibility.
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