I believe that the reference to `optically-scaled' refers to the phenomenon that, for most people, linear-scaled scaled fonts at small sizes seem less bold than the larger sizes. An optically-scaled fonts would be scaled bolder at small sizes so that, subjectively, the fonts would seem to be of the same weight. Randolph J. Herber, [log in to unmask], +1 630 840 2966, CD/OSS/CDF CDF-PK-149O Mail Stop 318 Fermilab, Kirk & Pine Rds., P.O. Box 500, Batavia, IL 60190-0500. (Speaking for myself and not for US, US DOE, FNAL nor URA.) (Product, trade, or service marks herein belong to their respective owners.) N 41 50 26.3 W 88 14 54.4 and altitude 700' approximately, WGS84 datum.