(I got my first pair of glasses for nearsightedness when I was in second grade. I wore them until my teens, then switched over to contact lenses. About a decade ago, some eye problems caused me to go back to glasses. Without correction I'm blind as a bat.)
I wasn't sure if the preschool's office manager checked her phone messages or email first, so I decided to contact her both ways. That way she could start working on finding a sub as soon as she got in. Making the call was easy, because I have the school's number in my phone contact list--all I had to do is pull it up and hit "call". Without glasses I just had to hold the phone really close to my face to see it. After that was done I sat in front of the computer, opened up the Internet browser, and realized I had a problem.
The screen was nothing but a blur.
Fortunately, I knew what to do. Holding down the "Control" key and the "+" key, I used the Zoom shortcut to make my browser screen larger. Without my glasses once wasn't enough, though, so I did it again. And again. And again. After four magnifications, only a third of the webpage was visible, but I could see what I was doing.
I typed my email, sent it, then went back to bed.