
Consistently weighted bottoms can also help reinforce the line of text. You are able to quickly figure out which part of the letter is down which aids in recognizing the correct letter, and sometimes helps to keep your brain from rotating them around.

Letters have heavy weighted bottoms to indicate direction. According to the site, OpenDyslexic is created to help with some of the symptoms of dyslexia. If you are not familiar with OpenDyslexic, it is basically a font that is designed to help readers with Dyslexia.
