I've been wearing glasses/contacts since second grade. When I first started in my career of staring at a monitor for 8-12+ hours a day my contacts would become irritated easily by the mid afternoon. I switched contact brands to Acuvue 2 Oasys which helped a lot, but my eyes still get tired / irritated by the end of the day (even when taking a short break every hour or so).
Which kind of contacts / glasses do you use? Do you like them? How long can you go without your eyes becoming irritated?