13. It's a Myth that Capital Letters are Inherently Hard to Read

Word Shape Theory

It's not true that UPPERCASE TEXT is harder to read than Mixed Case Text or lowercase text.

... But people aren't as used to reading uppercase, so they read it more slowly. Also, it's perceived as SHOUTING, so use sparingly.

Saccade and Fixation

Our eyes move in quick, sharp jumps as we read text (not fluidly). Our eyes mostly jump forward, but also look backward occasionally.

Saccade = when your eye jumps

Fixation = moment of stillness