I can't speak for the OP, but there have been studies of appropriate line lengths for reading text on computer displays. See for example https://web.archive.or

I can't speak for the OP, but there have been studies of appropriate line lengths for reading text on computer displays. See for example https://web.archive.org/web/20020725135307/http://psychology.wichita.edu/surl/usabilitynews/42/text_length.htm https://web.archive.org/web/20020725135307/http://psychology... (found via WardsWiki: http://c2.com/cgi/wiki?TenWordLine http://c2.com/cgi/wiki?TenWordLine). As you might expect, people who can read better can generally read longer lines, limited mainly by the number of words apprehended in a single "fix" or by the reader's visual acuity. The article I link to references research on both physical line length and characters per line, but the methodology described in the article itself attempts to fix physical size of a character and distance of the eye from the screen.