What are the speakers mainly discussing?

W: Hi．Jerry．How is your chemistry paper going?
M: It’s coming along．But I’ve been staring at this computer screen for hours and my eyes hurt．
W: Yeah．Doing that can make your eyes really dry and fired．You should take a break．
M: I can’t．I have to get this paper written．It’s due tomorrow．
W: You know, I read about computers and eye problems recently．The article says that they are usually caused by not blinking your eyes enough．
M: Blinking?I thought I just needed new glasses．
W: No，when you blink，the movement of closing and opening your eyes,  even though it happens really fast, helps moisten your eyes．It’s the lack of moisture that causes the problem．
M: That makes sense．But what do I have to do with the computer?
W: People who use computers tend to stare at the monitor and blink less often than they normally would．That leads to dry irritated eyes．
M: Well．that’s certainly how I feel now．They really hurt．I wonder if using some kind of eye-drops will make them feel better．
W: That might help．But the best prescription is to take a break and rest your eyes.
M: OK．Let’s go to get some coffee．I can finish this later tonight．