The Metrics menu allows you to activate dialog boxes to specify dimensional information about the font. The Metrics popup menu contains three options: Basics, Extended, and Effects.
Basic metrics includes information about character-range heights and such things as average widths, device resolution, and leading.
Extended metrics is detailed information about the geometry of the font, including such things as baseline, ascents and descents, orientation, scale, and so on.
Effects metrics is information about how to synthesize effects such as underlining and strikeout. To get to this dialog box, you must first go through the Extended Metrics dialog box.