What is the possible relationship ’between the two speakers?

M: What are you looking for, Alice?
W: I’m looking for my pen, Mike. I can’t see my pen.
M: It’s here, on the desk.
W: I’m sorry. But I’m getting so nearsighted. I’m afraid I have to wear glasses.
M: Your eyesight used to be very good, why?
W: Recently I have formed the habit of reading in bed. Sometimes I read on the moving bus.
M: Alice, you should pay attention to the care of your eyes. You should get rid of the bad reading habit. What’s more, you should relax your eyes as often as possible.
W: Thank you, Mike.