Magnifying one cell at a time for assisted reading

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The task was to write a program to make the letters in a single cell very large and display it with maximum contrast for use by people with impaired vision. I wrote such a program and wish to share it here in my own answer below. Comments and suggestions for improvement are welcome, as are alternative answers submitting programs written for the same purpose.

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The program demonstrated in the attached workbook allows the user to adjust the desired viewing size up to a multiple of 8 time the original size (more, if one amends the code). Colours for contrast, set to black on white by default, can be modifiedĀ in a location in the code especially prepared for that purpose.

The user can move around a sheet using either key strokes or mouse clicks. There is an F2 key which allows editing of a cell's formula in the enlargement.

The workbook contains a working demonstration as well as a dedicated Help tab that contains detailed instructions for installation, setup (very simple), modification (also easy) and use.

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