It is important to consider the actual nature of the reader’s visual loss. If he or she has a restricted field of vision and is trying to read through only a small area of clear vision, enlargement of the text may actually prove a hindrance rather than help because few characters will be visible at one time.
Enlarged photocopies - no amount of enlargement can be very helpful unless it produces a clear bold image for the reader. Always check what size of print the reader prefers rather than working to a standard enlargement for the sake of convenience.
Retyping text - many books are unsuitable for enlargement because of the nature of print, spacing or because it is overlaid on a diagram. Microsoft Word (or other word processors) can be used to produce the appropriate size and quality of print required.
Diagrams - it may be necessary to redraw diagrams rather than simply to enlarge them (see 1st paragrah). For a partially sighted reader simplicity is important. Care must be taken when labelling to prevent confusion - strongly coloured lines may be used. It may be better to use a key to prevent clutter in a diagram.
Maps - it may be necessary to break down a complex map into a series of simpler ones, which may be overlaid.
