How was the play, Mrs. Lincoln?

Your eyes are healthy, but you need bifocals.

I like my optometrist a lot but am a little confused. Can a body part be healthy if it can't do the one thing assigned to it?

It's like my primary care doctor saying I am generally healthy. Well yeah, if you ignore the massive disability that is going to kill me.

If my eyes were healthy,  I wouldn't need bifocals. But as it is, I will put off the books I got for Christmas till I have old-person glasses.