Hard to Read Lectures?

For years I’ve laboured to make my lecture materials as clear as possible and easy to read.  I tend to use prepared overheads and/or Powerpoints, and not too much blackboard work since my handwriting is a bit messy (and writing a lot on a blackboard or whiteboard gets to be a bit hard on arthritic hands).  However, now I find out I should be making my lecture materials harder to read!  Why is that? Continue reading