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Readability and font sizes

Preliminary notes for an article:

What is a ‘good’ font size for reading from a screen?  Lots of variables:

  • screen size/resolution
  • age/eyesight of viewer
  • length of paragraph
  • measure of paragraph
  • reader’s taste

I’ve always assumed that larger font size = more readable, but having read Vivien’s critique of my website, comments on the iA site and through listening to my work colleagues, I’m not so sure.

Garamond example

Garamond - not a body copy font

Can anyone point to any research on this?

Does the font type (serif vs. sans) have any effect?  I think that Georgia at 16px looks great and reads great, am willing to admit that helvetica/arial (and sans in general) not so much.

Congruence of taste and readability – emotional aspect?

Possible cop out – respect the user’s setting by specifying font-size: 100%, p {font-size: 1em;}.  Except – how many people actually change this setting.  Do you know any normal, non-geek people who do this?  Are there any stats on this?

Any pointers, ideas etc. welcome.