Thanks, all!
Digidave -- so glad to have someone enjoy my little trials.
Liz -- I have lots of family with glasses (me too) so I've been getting a lot of practice with this. It's one of those things I kind of knew in my head but until you actually make a mistake a few times it doesn't really stick, you know? Thanks for the tip.
Clockdoc -- I'll be interested to see what you have to say about the light as I do some more of these.