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Numerals

It is important that numbers are as distinct as possible. This is particularly vital for documents such as bills, bank statements, and accounts. Some typefaces have figures that are easily misread: 3, 5 and 8, as well as 0 and 6 can be easily confused. Also the figure one '1' can be confused with I, and l and even ! A 'hooked' number one is more distinctive than a straight vertical stroke '1'.

Choose a typeface with distinctive numbers. The RNIB publication 'See it right' had its New Baskerville figures redrawn to improve readability and help increase the distinction between different figures.

Interlinear space

Leave reasonable space between lines of type. RNIB suggests interlinear space should be at least +2pt for type sizes between 14pt and 20pt (eg. 14pt type with 16pt leading). This of course depends on line length and on the x-height of the type you are using. Lighthouse recommends adding 25 to 30 per cent of the text point size between lines. We're with Lighthouse on this one. Text set in longer lines needs more interlinear space than text set with a narrow measure (see 'Line length and line endings').

Line length and line endings

This should ideally be in the range of 50-65 characters. Some visually impaired people may prefer even shorter lines than this.

Avoid splitting words at the ends of lines. Switch hyphenation off.

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