Jokes about Dad's new glasses

My Dad needs glasses for the first time. He's in his 50s and needs them for reading small print. Happens to most people with age. No biggie...
-
However, I have worn glasses from a young age and he mocked me mercilessly for being a specky four-eyes with neverending delight. So now I have my opportunity for revenge - em, I mean, the opportunity to use humour to make him feel comfortable with his new glasses. I'd love to hear some more from you.

Here's what I have so far:

1

Me: Knock knock

Dad: Who's there?

Me: Can't you tell? Your new glasses mustn't be very good.

2

Me: Now I know why Corrie (our labrador while I was growing up) was so clever.

Dad: Why?

Me: Because she was a guide dog.

3

Dad: Can I have some juice?

Me: I'm afraid not. You're already using all the glasses.

4

Me: What's the difference between you and a blind person?

Dad: I don't know.

Me: Oh, can't you see the difference?

5

Me: Why did the chicken cross the road?

Dad: I don't know.

Me: It saw you driving and was looking for a place to hide.

6

Me: have you see the Two Ronnies 'four-eyes' sketch?

Dad: it's four-candles.

Me: Oh dear, your eyesight's worse than I thought.