I wasn't entirely sure who the girls in the second pictures were until I found the first one and noticed that the girl standing on the left is definately Katherine Eileen Cummings (my great aunt).
The other girl is either Katherine's sister Mary or her other sister, my Grandmother, Claire (also known as "Cecelia/Celia"). My Grandmother died before I was born and I did not see Mary often as a child but I did see Auntie Kay quite often and I think that's how I knew it was her in the more casual picture. The glasses threw me a little but something in her expression made me realize, "Oh, that's definately her."
I never knew Auntie Kay to wear glasses but I do remember her wearing contacts when I was growing up. I saw them on her dresser when I was a kid and thought the very idea of sticking little things into your eyes was just the weirdest thing.
I'm not sure when contacts were invented (or put into popular use by the masses) but I do know this may be the only picture I have of Katherine in glasses. There are tons of pictures of her from her late teens-30's and none of them show her wearing glasses.
I find it an interesting insight to her personality that she must have taken great care not to be photographed wearing them. I am pretty sure she wouldn't have had contacts until she was older, I just don't think they were in mass circulation then, but I could be wrong...