The Missing Three

The girls wear glasses to school.  They have very weak prescriptions, so they don't wear them when they are running around on the playground.  They do have to wear them in class or when they are reading at home.
This morning I said, "Get your glasses.  I want to clean them before you go to school."
The blond twin couldn't find either pair of her glasses.  It was an interesting development since she supposedly wore one pair at school yesterday.  She frantically ran from place to place looking for either pair of glasses.  She prefers the blue frames, but was desperate to find either pair.
The brunette twin handed me her glasses to clean.  She was a little smug because she had her glasses and her twin couldn't find either pair.  The brunette twin put the clean glasses on her face and walked away. 
A few minutes later I said, "Where are your glasses?"  The brunette twin looked at me and said, "I don't know."
Somehow between her trip from the kitchen to the powder room to the dining room, she took off her glasses.  Not only did she put them down, but she didn't remember doing it.  She started looking for her glasses.  A few minutes later she announced, "It's the strangest thing.  I cannot find my glasses."
Yes, she lost her glasses.  No, I don't know why she took them off her face and neither did she. 
We were all looking for any of the missing glasses when the clock chimed.  We had to leave for school.  It was too late to keep looking.
I don't know what they think they are doing after school, but there will be no fun for them until they find their glasses.  In fact, there might not be any fun even if they find their glasses.