Choosing caption typefaces
When deciding on the typeface for captions, remember that it should remain legible at very small sizes (6-9 points).
Consider the following criteria:
- Sans serifs are more readable at smaller sizes than serifs
- The typeface should include thin variations that are more readable at smaller sizes
- The typeface has larger x-heights
- The typeface has more open counters
- The typeface has more open letter spacing[1]
References
- Captions Part 2 - Fonts.com | Fonts.com | Fonts.com