• • • Visual impairment - moderate
• • • Visual impairment - severe
Large clear typefaces should be used to improve legibility for persons with low vision.
When choosing typefaces it is important to use characters that have clear 'open' shapes. Many people with low vision can easily misread such characters as 3, 5, 6, 8 and 9 if the tails curl over; this tends to blur or merge the shapes.
As can be seen above the characters of Helvetica are less clear and open than those of Gill Sans.
