Quote:
Originally Posted by Jellby
The "optimal" value, and whether there will be collisions or overlaps, depends on the particular font used, i.e. how the glyphs are sized and positioned inside the em-boxes.
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It actually depends on the measure - the length of the line. Longer measures require more leading so that the reader will be able to locate the start of the next line easily when they scan back to the left. A 6" ereader will generally have short measures though, so 1.2em is about right. If your font is causing collisions at that setting then it's very unusual (or maybe just badly designed), though fonts which have an exaggerated x-height may need more leading to maintain adequate white-space between the lines.