I'd almost stopped paying attention to continuing education courses and similar articles in trade magazines over the years, but I've really been impressed with the stuff appearing in the past few issues of 20/20. They've had some high quality articles on coatings, wrapped lenses, etcetera. The magazine has definitely improved a lot over the years (at one point, it seemed geared mainly toward frame advertisements, but now offers quite a few substantive articles, as well as the Lenses & Technology column).
Anyway, if you don't already have a subscription to the magazine, you might check it out.
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