When it comes to visual displays, there are four main aspects to keep in mind in terms of legibility.
Typeface
Choose sans serif fonts such as Tahoma, Calibri, Helvetica, Arial and Verdana.
Certain font characteristics can make text difficult to read:
Condensed, extended or fonts with lighter weights
Wide variation in stroke width
Thin strokes that fade, break or disappear
Letters and numbers that closely resemble each other
Shapes of “d” and “a”
Shapes of “6” and “8”
Type Style & Size
Do not set text in all caps.
Use only for titles and decorative headings.
Avoid the use of script and italic type for essential information.
If an exhibition title is presented in an ornate or decorative type, it should be repeated in a clearer type at an accessible location near the exhibition entrance.
Provide alternative forms of labels within the exhibit space (Braille, large print, etc).
Select type size based on viewing distance.
Left justify the text box.
Reproduction Quality
Diminish glare on label surfaces.
Print only on a solid background.
Boost the contrast between text and background.
Environmental Conditions
Provide sufficient light of 100-300 lux.
If this level of light is unsustainable due to an object’s sensitivity to light, allow readers to get closer to the label.
Choose label holders that limit glare.
Locate labels in consistent locations.
Keep in mind the natural line of sight when mounting labels.
Labels should be mounted between 48" and 67" from the floor with 54" being ideal.
Mount label rails so the top is 40" above the floor.
Define labels with color or raised surface.
Readability
One important aspect of accessible exhibition information is to ensure that labels have high readability. This means that a reader can follow and understand the words, sentences and paragraphs. It is essential to consider the content and arrangement of your labels.
Content
Avoid the use of:
Colloquialisms
Complex English
Jargon
Technical language
Use active voice.
Provide a short overview paragraph at the beginning of the introductory and thematic label panels.
Arrangement
Limit sentence and label length.
Sentences should be 15-25 words and labels should be no more than 100 words.
Use a line length that facilitates reading.
45-50 characters per line makes the text easier to read
Provide line drawings, silhouettes and photographs to help with comprehension.
